DA0-001 Exam Guide, Objectives & Preparation

Exam Overview

Exam Code	DA0-001
Exam Name	CompTIA Data+ Certification
Vendor	CompTIA
Total Questions	363
Last Updated	26-Oct, 2026

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Free DA0-001 Practice Questions

Explore 5 free practice questions for the CompTIA DA0-001 exam and review the answers and explanations to support your preparation.

Question 1
Single answer

Which of the following BEST describes the issue in which character values are mixed with integer
values in a data set column?
- Option A:
  Duplicate data
  
  Correct
- Option B:
  Missing data
  
  Correct
- Option C:
  Data outliers
  
  Correct
- Option D:
  Invalid data type
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: D

Explanation

The invalid data type is the best description for the issue in which character values are mixed with
integer values in a data set column. Invalid data type means that the data does not match the
expected or required format or structure for a given variable or attribute. For example, if a columnis
supposed to store numerical values, but some rows contain text values, then those rows have an
invalid data type. Reference: CompTIA Data+ Certification Exam Objectives, page
Question 2
Single answer

A data analyst has been asked to organize the table below in the following ways:
By sales from high to low -
By state in alphabetic order -
Which of the following functions will allow the data analyst to organize the table in this manner?
- Option A:
  Conditional formatting
  Correct
- Option B:
  Grouping
  Correct
- Option C:
  Filtering
  Correct
- Option D:
  Sorting
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: D

Explanation

Sorting is the function that will allow the data analyst to organize the table in the desired
manner. Sorting means arranging the data in a specific order, such as ascending or
descending, based on one or more criteria. Sorting can be applied to any column in the
table, such as sales or state.
Question 3
Multiple answers

Which of the following actions should be taken when transmitting data to mitigate the chance of a
data leak occurring? (Choose two.)
- Option A:
  Data identification
  Correct
- Option B:
  Data processing
  Correct
- Option C:
  Data Reporting
  Correct
- Option D:
  Data encryption
  Correct
- Option E:
  Data masking
  
  Correct
- Option F:
  Fata removal
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: D, E

Explanation

Data encryption and data masking are two actions that can be taken when transmitting data to
mitigate the chance of a data leak occurring. Data encryption means transforming data into an
unreadable format that can only be decrypted with a key. Data masking means hiding or replacing
sensitive data with fictitious or anonymized data. Both methods protect the confidentiality and
integrity of the data in transit. Reference: CompTIA Data+ Certification Exam Objectives, page
Question 4
Multiple answers

A customer list from a financial services company is shown below:

A data analyst wants to create a likely-to-buy score on a scale from 0 to 100, based on an average of
the three numerical variables: number of credit cards, age, and income. Which of the following
should the analyst do to the variables to ensure they all have the same weight in the score
calculation?
- Option A:
  Recode the variables.
  Correct
- Option B:
  Calculate the percentiles of the variables.
  Correct
- Option C:
  Calculate the standard deviations of the variables.
  Correct
- Option D:
  Normalize the variables
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: D

Explanation

Normalizing the variables means scaling them to a common range, such as 0 to 1 or -1 to 1, so that
they have the same weight in the score calculation. Recoding the variables means changing their
values or categories, which would alter their meaning and distribution. Calculating the percentiles of
the variables means ranking them relative to each other, which would not account for their actual
magnitudes. Calculating the standard deviations of the variables means measuring their variability,
which would not make them comparable.
Question 5
Multiple answers

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

Which of the following is the mean?
- Option A:
  $2,466.18
  
  Correct
- Option B:
  $2,667.60
  Correct
- Option C:
  $3,082.72
  Correct
- Option D:
  $12,330.88
  Correct
Show Answer & Explanation Hide Answer & Explanation

Correct Answer: C

Explanation

The mean is the average of all the values in a data set. To calculate the mean, we add up all the
values and divide by the number of values. In this case, the mean for Q1 sales is ($2,000 + $3,000 +
$4,000 + $2,500 + $3,500) / 5 = $3,082.72

Free DA0-001 Practice Questions

Question 1

Which of the following BEST describes the issue in which character values are mixed with integervalues in a data set column?

Duplicate data

Missing data

Data outliers

Invalid data type

Question 2

A data analyst has been asked to organize the table below in the following ways:By sales from high to low -By state in alphabetic order -

Which of the following functions will allow the data analyst to organize the table in this manner?

Conditional formatting

Grouping

Filtering

Sorting

Sorting is the function that will allow the data analyst to organize the table in the desiredmanner. Sorting means arranging the data in a specific order, such as ascending ordescending, based on one or more criteria. Sorting can be applied to any column in thetable, such as sales or state.

Question 3

Which of the following actions should be taken when transmitting data to mitigate the chance of a

data leak occurring? (Choose two.)

Data identification

Data processing

Data Reporting

Data encryption

Data masking

Fata removal

Question 4

A customer list from a financial services company is shown below:

A data analyst wants to create a likely-to-buy score on a scale from 0 to 100, based on an average ofthe three numerical variables: number of credit cards, age, and income. Which of the followingshould the analyst do to the variables to ensure they all have the same weight in the scorecalculation?

Recode the variables.

Calculate the percentiles of the variables.

Calculate the standard deviations of the variables.

Normalize the variables

Question 5

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

Which of the following is the mean?

$2,466.18

$2,667.60

$3,082.72

$12,330.88

The mean is the average of all the values in a data set. To calculate the mean, we add up all thevalues and divide by the number of values. In this case, the mean for Q1 sales is ($2,000 + $3,000 +$4,000 + $2,500 + $3,500) / 5 = $3,082.72

Which of the following BEST describes the issue in which character values are mixed with integer
values in a data set column?

A data analyst has been asked to organize the table below in the following ways:
By sales from high to low -
By state in alphabetic order -

Sorting is the function that will allow the data analyst to organize the table in the desired
manner. Sorting means arranging the data in a specific order, such as ascending or
descending, based on one or more criteria. Sorting can be applied to any column in the
table, such as sales or state.

The mean is the average of all the values in a data set. To calculate the mean, we add up all the
values and divide by the number of values. In this case, the mean for Q1 sales is ($2,000 + $3,000 +
$4,000 + $2,500 + $3,500) / 5 = $3,082.72