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DA0-001 CompTIA Data+ Certification Exam Questions and Answers

Questions 4

Five dogs have the following heights in millimeters:

300, 430, 170, 470, 600

Which of the following is the mean height for the five dogs?

Options:

A.

394mm

B.

405mm

C.

493mm

D.

504mm

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Questions 5

Which of the following will MOST likely be streamed live?

Options:

A.

Machine data

B.

Key-value pairs

C.

Delimited rows

D.

Flat files

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Questions 6

A data analyst wants to create "Income Categories" that would be calculated based on the existing variable "Income". The "Income Categories" would be as follows:

Income category 1: less than $1.

Income category 2: more than $1 and less than $20,000.

Income category 3: more than $20,001 and less than $40,000.

Income category 4: more than $40,001.

Which of the following data manipulation techniques should the data analyst use to create "Income Categories"?

Options:

A.

Data merge

B.

Derived variables

C.

Data blending

D.

Data append

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Questions 7

Which of the following is a domain-specific language used in programming that is designed for managing data that is held in a relational data stream management system?

Options:

A.

SAS

B.

SQL

C.

Python

D.

R

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Questions 8

Five dogs have the following heights in millimeters:

300,430, 170, 470, 600

Which of the following is the standard deviation for the five dogs?

Options:

A.

147mm

B.

154mm

C.

394 mm

D.

21,704mm

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Questions 9

An analyst is required to run a text analysis of data that is found in articles from a digital news outlet. Which of the following would be the BEST technique for the analyst to apply to acquire the data?

Options:

A.

Web scraping

B.

Sampling

C.

Data wrangling

D.

ETL

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Questions 10

An analyst has generated a report that includes the number of months in the first two quarters of 2019 when sales exceeded $50,000:

DA0-001 Question 10

Which of the following functions did the analyst use to generate the data in the Sales_indicator column?

Options:

A.

Aggregate

B.

Logical

C.

Date

D.

Sort

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Questions 11

Which of the following is a non-parametric test?

Options:

A.

One-sample t-test

B.

Two-way ANOVA

C.

Correlation coefficient

D.

Spearman's rank correlation

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Questions 12

Which of the following roles is responsible for ensuring an organization's data quality, security, privacy, and regulatory compliance?

Options:

A.

Data owner.

B.

Data steward.

C.

Data custodian.

D.

Data processor.

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Questions 13

What R package makes it easy to work with dates?

Options:

A.

Lubridate.

B.

Datemath.

C.

Stringr.

D.

ggplot.

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Questions 14

After completing web scraping, which of the following file formats needs to be parsed?

Options:

A.

.html

B.

.txt

C.

.csv

D.

.tsv

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Questions 15

An analyst has conducted a review of business questions. Which of the following should the analyst do next to conduct an analysis?

Options:

A.

Determine the data needs and review the observations.

B.

Determine the data needs and sources for analysis.

C.

Determine the data needs and schedule interviews.

D.

Determine the data needs and begin the analysis.

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Questions 16

An analyst collected data that includes primary account numbers, expiration dates, and service codes. Which of the following data governance classifications is used to describe this data?

Options:

A.

PI I

B.

PCI

C.

PBI

D.

PHI

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Questions 17

Which of the following technologies would be best suited for creating a multiple linear regression model?

Options:

A.

Microsoft Power Bl

B.

R

C.

SQL

D.

Tableau

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Questions 18

Which of the following techniques is used to quantify data?

Options:

A.

Decoding

B.

Enumeration

C.

Coding

D.

Structure

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Questions 19

Which of the following concepts should be applied if a data set with 40 fields needs to be pared down to 20 fields and contains similar data across multiple fields?

Options:

A.

Duplication

B.

Consolidation

C.

Compliance

D.

Standardization

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Questions 20

An e-commerce company recently tested a new website layout. The website was tested by a test group of customers, and an old website was presented to a control group. The table below shows the percentage of users in each group who made purchases on the websites:

DA0-001 Question 20

Which of the following conclusions is accurate at a 95% confidence interval?

Options:

A.

In Germany, the increase in conversion from the new layout was not significant.

B.

In France, the increase in conversion from the new layout was not significant.

C.

In general, users who visit the new website are more likely to make a purchase.

D.

The new layout has the lowest conversion rates in the United Kingdom.

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Questions 21

An analyst is designing a dashboard to determine which site has the highest percentage of new customers. The analyst must choose an appropriate chart to include in the dashboard. The following data is available:

DA0-001 Question 21

Which of the following types of charts should be considered to BEST display the data?

Options:

A.

Include a bar chart using the site and the percentage of new customers data.

B.

Include a line chart using the site and the percentage of new customers data.

C.

Include a pie chat using the site and percentage of new customers data.

D.

Include a scatter chart using the site and the percent of new customers data.

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Questions 22

An analyst is creating a resource to improve users' experience when they select specific records based on particular dates. Which of the following should the analyst use to create a resource that best meets user needs?

Options:

A.

Drop-down menu

B.

Date range

C.

Text field

D.

Frequency

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Questions 23

Which of the following is a process that is used during data integration to collect, blend, and load data?

Options:

A.

MDM

B.

ETL

C.

OLTP

D.

BI

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Questions 24

A database consists of one fact table that is composed of multiple dimensions. Depending on the dimension, each one can be represented by a denormalized table or multiple normalized tables. This structure is an example of a:

Options:

A.

transactional schema.

B.

star schema.

C.

non-relational schema.

D.

snowflake schema.

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Questions 25

A data analyst is designing a dashboard that will provide a story of sales and determine which site is providing the highest sales volume per customer The analyst must choose an appropriate chart to include in the dashboard. The following data is available:

DA0-001 Question 25

Which of the following types of charts should be considered?

Options:

A.

Include a line chart using the site and average sales per customer.

B.

Include a pie chart using the site and sales to average sales per customer.

C.

Include a scatter chart using sales volume and average sales per customer.

D.

Include a column chart using the site and sales to average sales per customer.

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Questions 26

The process of performing initial investigations on data to spot outliers, discover patterns, and test assumptions with statistical insight and graphical visualization is called:

Options:

A.

a t-test.

B.

a performance analysis.

C.

an exploratory data analysis.

D.

a link analysis.

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Questions 27

You should always choose the analytics tool that is most appropriate for any given situation, even if that means acquiring a new tool.

Options:

A.

True.

B.

False.

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Questions 28

A stakeholder wants to see daily sales targets organized in a dashboard by country, state, city, and ZIP Code. Which of the following delivery considerations must a data analyst take into account when creating the dashboard?

Options:

A.

Variable formatting

B.

Drill-down capability

C.

Saved searches

D.

Access permissions

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Questions 29

Which of the following is an object associated with a table that sorts and stores table row data in a key-value pair?

Options:

A.

Foreign key

B.

Function

C.

Stored procedure

D.

Clustered index

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Questions 30

A customer survey reveals 90% positive feedback. Which of the following statistical methods would be best to utilize to determine the reliability of a data set and predict how a larger sample of customers over the same time period might respond?

Options:

A.

Calculate a high variance on survey responses.

B.

Calculate the maximum range of the survey responses.

C.

Calculate a low standard deviation on survey responses.

D.

Remove any data more than 4 standard deviation from the mean.

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Questions 31

A data analyst needs to create a master file that includes customer information from the tables below:

DA0-001 Question 31

Given the three tables above, the analyst wants to filter down the information prior to joining it together. In which of the following orders should this data manipulation bo approached for the most efficient result?

Options:

A.

Merge, append, deduplicate

B.

Merge, deduplicate, append

C.

Deduplicate, append, merge

D.

Append, deduplicate, merge

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Questions 32

Which of the following best describes an exploratory analysis?

Options:

A.

Involves the use of descriptive statistics to understand observations

B.

Involves analysis of exploring data sets for performance tracking

C.

Involves the testing of specific hypotheses

D.

Involves the use of arithmetic algebra to determine the distribution

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Questions 33

A data analyst is using a two-tailed, independent t-test to determine whether the type of stretching, dynamic or static, has any influence on a dancer's flexibility. Which of the following is the alternative hypothesis?

Options:

A.

A dancer's flexibility is improved through static stretching.

B.

The change in a dancer's flexibility is not equal to zero.

C.

There is a difference in a dancer's flexibility between static and dynamic stretching.

D.

The means of the static and dynamic stretching groups do not differ from each other.

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Questions 34

A data analyst is developing a data dictionary that aligns with a company's data management processes and policies. Which of the following best describes what should be included in the data dictionary?

Options:

A.

Information containing the links to business data

B.

Information explaining the business methodologies

C.

Information containing definitions of the business data

D.

Information describing the data analysis phases

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Questions 35

Which of the following are reasons to conduct data cleansing? (Select two).

Options:

A.

To perform web scraping

B.

To track KPls

C.

To improve accuracy

D.

To review data sets

E.

To increase the sample size

F.

To calculate trends

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Questions 36

Which of the following is the best description of the term "data governance"?

Options:

A.

Data governance governs the development of a data visualization dashboard in an organization.

B.

Data governance is the policy that protects against data breaches by cybercriminals.

C.

Data governance is the process of analyzing, manipulating, and reporting data in an organization.

D.

Data governance is the availability, usability, integrity, and security of data in an enterprise.

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Questions 37

Which of the following is an example of a discrete data type?

Options:

A.

8in (20cm)

B.

5 kids

C.

2.5mi (4km)

D.

10.7lbs (4.9kg)

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Questions 38

An analyst needs to determine the appropriate data type for the following sample data:

sample data collected:

Which of the following data types should be used for this data?

Options:

A.

Text

B.

Float

C.

Alphanumeric

D.

Numeric

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Questions 39

Given the following customer and order tables:

Which of the following describes the number of rows and columns of data that would be present after performing an INNER JOIN of the tables?

Options:

A.

Five rows, eight columns

B.

Seven rows, eight columns

C.

Eight rows, seven columns

D.

Nine rows, five columns

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Questions 40

A data analyst has received a data set that contains actual and projected sales for the fourth quarter of 2019. Which of the following statistical methods should the analyst use to find the measure of dispersion?

Options:

A.

Mean

B.

Variance

C.

Correlation

D.

Confidence interval

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Questions 41

‘Which of the following is the BEST reason to use database views instead of tables?

Options:

A.

Views reduce the need for repetitive, complex data joins.

B.

Views allow for the storage of temporary data. whereas tables do not.

C.

Views allow for the joining of multiple data sources, whereas tables do not.

D.

Views can be used to restrict sensitive information.

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Questions 42

Which of the following should be accomplished NEXT after understanding a business requirement for a data analysis report?

Options:

A.

Rephrase the business requirement.

B.

Determine the data necessary for the analysis

C.

Build a mock dashboard/presentation layout.

D.

Perform exploratory data analysis.

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Questions 43

A data analyst needs to perform a full outer join of a customer's orders using the tables below:

DA0-001 Question 43

Which of the following is the mean of the order quantity?

Options:

A.

73.5

B.

76.5

C.

78.8

D.

81.5

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Questions 44

Which one of the following values will appear first if they are sorted in descending order?

Options:

A.

Aaron.

B.

Molly.

C.

Xavier.

D.

Adam.

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Questions 45

Randy scored 76 on a math test, Katie scored 86 on a science test, Ralph scored 80 on a history test, and Jean scored 80 on an English test. The table below contains the mean and standard deviation of the scores for each of the courses:

DA0-001 Question 45

Using this information, which of the following students had the BEST score?

Options:

A.

Randy

B.

Katie

C.

Ralph

D.

Jean

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Questions 46

A web developer wants to ensure that malicious users can't type SQL statements when they asked for input, like their username/userid.

Which of the following query optimization techniques would effectively prevent SQL Injection attacks?

Options:

A.

Indexing.

B.

Subset of records.

C.

Temporary table in the query set.

D.

Parametrization.

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Questions 47

An analyst is designing a dashboard to determine which site has the highest percentage of new customers. The analyst must choose an appropriate chart to include in the dashboard. The following data is available:

DA0-001 Question 47

Which of the following types of charts should be considered to best display the data?

Options:

A.

Include a bar chart using the site and the percentage of new customers data.

B.

Include a line chart using the site and the percentage of new customers data.

C.

Include a pie chart using the site and percentage of new custorners data.

D.

Include a scatter chart using the site and the percent of new customers data.

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Questions 48

A database consists of one fact table that is composed of multiple dimensions. Each dimension is represented by a denormalized table. This structure is an example of a:

Options:

A.

non-relational schema.

B.

galaxy schema.

C.

snowflake schema.

D.

star schema.

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Questions 49

Which of the following data types would a telephone number formatted as XXX-XXX-XXXX be considered?

Options:

A.

Numeric

B.

Date

C.

Float

D.

Text

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Questions 50

Given the image below:

DA0-001 Question 50

The data should be cleaned because of the presence of:

Options:

A.

outlier

B.

non-parametric data.

C.

multicollinearity.

D.

invalid data.

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Questions 51

Which one of the following in NOT a common data integration tool?

Options:

A.

XSS

B.

ELT

C.

ETL

D.

APIs

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Questions 52

Which of the following is an example of a discrete variable?

Options:

A.

The temperature of a hot tub

B.

The height of a horse

C.

The time to complete a task

D.

The number of people in an office

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Questions 53

A sales manager wants quarterly sales reports broken down by unit and week. Which of the following data output lists includes the most necessary information?

Options:

A.

Order number. salesperson. date shipped, recipient address, and price

B.

Item name, salesperson. recipient address, shipping cost. and date shipped

C.

Item number, item name, salesperson. date sold. and price

D.

Item name. salesperson. price. shipping cost. and date shipped

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Questions 54

A company wants to know how its customers interact with an e-commerce website based on clicks over items. Which of the following is the primary requirement for this report?

Options:

A.

Data content

B.

Frequency

C.

Filtering

D.

Views

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Questions 55

Given the following report:

DA0-001 Question 55

Which of the following components need to be added to ensure the report is point-in-time and static? (Select two).

Options:

A.

A control group for the phrases

B.

A summary of the KPIs

C.

Filter buttons for the status

D.

The date when the report was last accessed

E.

The time period lhe report covers

F.

The date on which the report was run

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Questions 56

A database administrator needs to ensure only approved users can access specific database tables to perform financial functions. Which of the following is the best access control method for the administrator to use?

Options:

A.

Role-based

B.

Rule-based

C.

Discretionary

D.

Group-based

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Questions 57

What would be an example of an acceptable form of primary identification for the Data+ exam?

Options:

A.

Passport.

B.

School ID card.

C.

Employee ID card.

D.

Credit card with photo and signature.

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Questions 58

While reviewing survey data, an analyst notices respondents entered “Jan,” “January,” and “01” as responses for the month of January. Which of the following steps should be taken to ensure data consistency?

Options:

A.

Delete any of the responses that do not have “January” written out.

B.

Replace any of the responses that have “01”.

C.

Filter on any of the responses that do not say “January” and update them to “January”.

D.

Sort any of the responses that say “Jan” and update them to “01”.

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Questions 59

Which of the following is a common data analytics tool that is also used as an interpreted, high-level, general-purpose programming language?

Options:

A.

SAS

B.

Microsoft Power BI

C.

IBM SPSS

D.

Python

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Questions 60

An analyst needs to summarize the number of people in Chicago in 2022 using the following set of data:

DA0-001 Question 60

Which of the following steps should the analyst use to provide results? (Select two).

Options:

A.

Aggregation

B.

Sorting

C.

Filtering

D.

Indexing

E.

Cleaning

F.

Replacing

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Questions 61

A company's human resources department has asked a data analyst to categorize the income of all employees into five salary bands:

DA0-001 Question 61

Which of the following types of functions would be the most appropriate to use?

Options:

A.

Statistical

B.

Aggregate

C.

Logical

D.

Mathematical

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Questions 62

A user receives a large custom report to track company sales across various date ranges. The user then completes a series of manual calculations for each date range. Which of the following should an analyst suggest so the user has a dynamic, seamless experience?

Options:

A.

Create multiple reports, one for each needed date range.

B.

Build calculations into the report so they are done automatically.

C.

Add macros to the report to speed up the filtering and calculations process.

D.

Create a dashboard with a date range picker and calculations built in.

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Questions 63

An analyst modified a data set that had a number of issues. Given the original and modified versions:

DA0-001 Question 63

Which of the following data manipulation techniques did the analyst use?

Options:

A.

Imputation

B.

Recoding

C.

Parsing

D.

Deriving

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Questions 64

A data analyst is performing a data merge within a spreadsheet using the tables below:

https://www.bing.com/images/blob?bcid=S1XCF9p02M4GjpbGxHj0lrIaj9sw.....4c DA0-001 Question 64

The analyst is attempting to pull the addresses from Table 2 into Table 1 using the last names and is receiving an error message. Which of the following steps can the analyst perform to fix the error?

Options:

A.

Use concatenate to combine the tables.

B.

Ensure the formula is pulling from right to left.

C.

Sort the data by the last name field.

D.

Review the spelling and data type.

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Questions 65

Which of the following is the best variable formal to store a customer's age using the least possible amount of storage data?

Options:

A.

Int

B.

Float

C.

Char

D.

Double

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Questions 66

A development company is constructing a new Init in its apartment complex. The complex has the following floor plans:

DA0-001 Question 66

Using the average cost per square foot of the original floor plans. which of the following should be the price of the Rose Init?

Options:

A.

$640,900

B.

$690,000

C.

$705,200

D.

$702,500

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Questions 67

Which of the following data governance concepts fits into the security requirements category?

Options:

A.

Data transmission

B.

Data deletion

C.

Data use agreements

D.

Personally identifiable information

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Questions 68

Which one of the following programming languages is specifically designed for use in analytics applications?

Options:

A.

Python.

B.

R

C.

C++

D.

Java.

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Questions 69

A JSON file is an example of:

Options:

A.

structured data.

B.

web data.

C.

machine data.

D.

processed data.

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Questions 70

An analyst needs to join two tables of data together for analysis. All the names and cities in the first table should be joined with the corresponding ages in the second table, if applicable.

DA0-001 Question 70

Which of the following is the correct join the analyst should complete. and how many total rows will be in one table?

Options:

A.

INNER JOIN, two rows

B.

LEFT JOIN. four rows

C.

RIGHT JOIN. five rows

D.

OUTER JOIN, seven rows

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Questions 71

Which of the following is a characteristic of a relational database?

Options:

A.

It utilizes key-value pairs.

B.

It has undefined fields.

C.

It is structured in nature.

D.

It uses minimal memory.

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Questions 72

Which of the following is a difference between a primary key and a unique key?

Options:

A.

A unique key cannot take null values, whereas a primary key can take null values.

B.

There can be only one primary key in a data set, whereas there can be multiple unique keys.

C.

A primary key can take a value more than once, whereas a unique key cannot take a value more than once.

D.

A primary key cannot be a date variable, whereas a unique key can be.

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Questions 73

A Chief Executive Officer (CEO) is requesting more up-to-date sales data for improved visibility prior to month-end. An analyst must determine the frequency of a sales report that was previously distributed on an as-needed basis. Which of the following would be the most appropriate frequency for this report?

Options:

A.

Monthly

B.

Quarterly

C.

Weekly

D.

Every other month

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Questions 74

Which of the following is a relational database?

Options:

A.

SQL

B.

Excel

C.

JSON

D.

NoSQL

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Questions 75

The number of phone calls that the call center receives in a day is an example of:

Options:

A.

continuous data.

B.

categorical data.

C.

ordinal data.

D.

discrete data.

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Questions 76

What subset of Structured Query Language (SQL) is used to add, remove, modify, or retrieve the information stored within a relational database?

Options:

A.

DDL.

B.

DSL.

C.

DQL.

D.

DML.

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Questions 77

Which of the following describes the use of a representative amount of data from a main repository?

Options:

A.

Observation

B.

Delta load

C.

Web scraping

D.

Sampling

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Questions 78

Which of the following is the best technique for transferring data from one database to another with some data manipulation?

Options:

A.

Application programming interfaces

B.

Delta load

C.

Extract, transform, load

D.

Export/import

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Questions 79

An analyst wants to create a historical data set for the past five years with each year in its own data set. Which of the following methods is the best way to create this historical data set?

Options:

A.

Data transpose

B.

Data concatenation

C.

Data append

D.

Data normalization

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Questions 80

Which of the following describes the method of sampling in which elements of data are selected randomly from each of the small subgroups within a population?

Options:

A.

Simple random

B.

Cluster

C.

Systematic

D.

Stratified

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Questions 81

Which of the following query statements would be used when filtering data in a relational database management system? (Select two).

Options:

A.

ORDER BY

B.

HAVING

C.

WHERE

D.

SELECT

E.

INSERT

F.

GROUP BY

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Questions 82

Which of the following database schemas features normalized dimension tables?

Options:

A.

Flat

B.

Snowflake

C.

Hierarchical

D.

Star

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Questions 83

A data analyst needs to calculate the mean for Q1 sales using the data set below:

DA0-001 Question 83

Which of the following is the mean?

Options:

A.

$2,466.18

B.

$2,667.60

C.

$3,082.72

D.

$12,330.88

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Questions 84

Which of the following is the correct data type for text?

Options:

A.

Boolean

B.

String

C.

Integer

D.

Float

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Questions 85

An analyst is working with the income data of suburban families in the United States. The data set has a lot of outliers, and the analyst needs to provide a measure that represents the typical income. Which of the following would BEST fulfill the analyst’s goal?

Options:

A.

Median

B.

Mean

C.

Mode

D.

Standard deviation

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Questions 86

Amanda needs to create a dashboard that will draw information from many other data sources and present it to business leaders.

Which one of the following tools is least likely to meet her needs?

Options:

A.

QuickSight.

B.

Tableau.

C.

Power BI.

D.

SPSS Modeler.

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Questions 87

Which of the following is used for calculations and pivot tables?

Options:

A.

IBM SPSS

B.

SAS

C.

Microsoft Excel

D.

Domo

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Questions 88

A database administrator is required to mask certain table columns containing Pll in order to comply with the company privacy policy. Which of the following are the most likely types of information the administrator should mask? (Select two).

Options:

A.

Government-issued ID

B.

Address

C.

Order ID

D.

Order date

E.

Customer ID

F.

Referral number

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Questions 89

What SQL command is used to delete an entire table from a database?

Options:

A.

DROP.

B.

MODIFY.

C.

DELETE.

D.

ALTER.

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Questions 90

Taylor wants to investigate how manufacturing, marketing, and sales expenditures impact overall profitability for her company.

Which of the following systems is the most appropriate?

Options:

A.

OLTP.

B.

OLAP.

C.

Data warehouse.

D.

Data mart.

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Questions 91

Alex wants to use data from his corporate sale, CRM, and shipping systems to try and predict future sales.

Which of the following systems is the most appropriate?

Choose the best answer.

Options:

A.

Data mart.

B.

OLAP.

C.

Data Warehouse.

D.

OLTP.

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Questions 92

Which of the following is a best practice when updating a legacy data source?

Options:

A.

Placing old data in new fields

B.

Keeping only the most recent data

C.

Creating a codebook to document field changes

D.

Removing the data source from production

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Questions 93

A user imports a data file into the accounts payable system each day. On a regular basis. the field input is not what the system is expecting. so it results in an error for the row and a broken import process. To resolve the issue, the user opens the file, finds the error in the row, and manually corrects it before attempting the import again. The import sometimes breaks on subsequent attempts. though. Which of the following changes should be made to this process to reduce the number of errors?

Options:

A.

Delete all incorrect inputs and upload the corrected file.

B.

Have the user manually review the file for data completeness before loading it

C.

Create a data field to data type validator to run the file through prior to import.

D.

Spot-check the file prior to import to catch and correct field errors.

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Questions 94

Given the table below:

DA0-001 Question 94

Which of the following boxes indicates that a Type Il error has occurred?

Options:

A.

1

B.

2

C.

3

D.

4

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Exam Code: DA0-001
Exam Name: CompTIA Data+ Certification Exam
Last Update: Dec 2, 2024
Questions: 314

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