CompTIA DA0-001 Practice Test 2026

Updated On : 20-May-2026

Prepare smarter and boost your chances of success with our CompTIA DA0-001 practice test 2026. These CompTIA Data+ Certification Exam test questions helps you assess your knowledge, pinpoint strengths, and target areas for improvement. Surveys and user data from multiple platforms show that individuals who use DA0-001 practice exam are 40–50% more likely to pass on their first attempt.

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Given the following data sample:

Which of the following best describes the data quality issue?

A. Data outlier

B. Consistent data

C. Duplicate data

D. Invalid data

C.   Duplicate data

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

Which of the following is the mean?

A. $2,466.18

B. $2,667.60

C. $3,082.72

D. $12,330.88

C.   $3,082.72

A county in Illinois is conducting a survey to determine the mean annual income per household. The county is 427sq mi (2.65q km). Which of the following sampling methods would MOST likely result in a representative sample?

A. A stratified phone survey of 100 people that is conducted between 2:00 p.m. and 3:00 p.m.

B. A systematic survey that is sent to 100 single-family homes in the county

C. Surveys sent to ten randomly selected homes within 5mi (8km) of the county’s office

D. Surveys sent to 100 randomly selected homes that are reflective of the population

D.   Surveys sent to 100 randomly selected homes that are reflective of the population

A junior web developer is developing a new application where users can upload short videos. The first task is to create a homepage that shows the headline "Upload Your Short Videos" and a clickable button that says "upload now".

Which of the following HTML commands would help the developer to complete the task successfully?

A. < span >Upload Your Short Videos< /span >< button >upload now< /button >

B. < p >Upload Your Short Videos< /p >< p >upload now< /p >

C. < hl >Upload Your Short Videos< /h1 >< button >upload now< /button >

D. < hl >Upload Your Short Videos< /h1 >< hl >upload now< /h1 >

C.   < hl >Upload Your Short Videos< /h1 >< button >upload now< /button >

Which of the following statements would be used to append two tables that have the same number of columns?

A. UNION ALL

B. MERGE

C. GROUP BY

D. JOIN

A.   UNION ALL

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:

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

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.

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

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:

A. transactional schema.

B. star schema.

C. non-relational schema.

D. snowflake schema.

B.   star schema.

A data analyst who works for a government agency is required to obtain the average income of citizens. The list of citizens is given in the following table:

A value for one citizen's income is missing. Which of the following approaches should the data analyst take to solve this issue?

A. Replace the missing value with the average of the rest of the unemployed citizens.

B. Insert the value 0 into the field with the missing value.

C. Impute the mean of the other citizens' incomes into the field with the missing value.

D. Exclude employed citizens from the analysis.

C.   Impute the mean of the other citizens' incomes into the field with the missing value.

An analyst wants to combine two data sets into a single spreadsheet. Column names from the first spreadsheet are listed in rows in the second spreadsheet. Which of the following is the first step the analyst should take to combine the data sets?

A. Blend

B. Merge

C. Concatenate

D. Transpose

C.   Concatenate

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?

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.

C.   Create a data field to data type validator to run the file through prior to import.
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CompTIA Data+ Certification Exam Practice Questions

CompTIA Data+ DA0-001 Official Exam Blueprint & Weight


CompTIA Data+ DA0-001 Domain Official Exam Weight
Data Concepts and Environments 15%
Subtopics: Data schemas, Dimensions, Data types, Data structures, File formats, Database concepts, Data environments, Structured data, Unstructured data, Semi-structured data
Data Mining 25%
Subtopics: Data acquisition, Data cleansing, Data profiling, Data manipulation, Query optimization, Data transformation, Data validation, ETL concepts, Data quality, Data preparation
Data Analysis 23%
Subtopics: Descriptive statistics, Inferential statistics, Statistical methods, Trend analysis, Data analytics tools, Key analysis techniques, Outlier detection, Correlation, Aggregation, Data interpretation
Visualization 23%
Subtopics: Reports, Dashboards, Business requirements, Visualization types, Chart selection, Dashboard development, Design components, Report types, Data storytelling, Presentation of insights
Data Governance, Quality, and Controls 14%
Subtopics: Data governance, Data quality control, Master data management, Data privacy, Data security, Compliance, Access controls, Data retention, Data integrity, Data stewardship

Ready to validate your data analytics expertise? This practice test mirrors the DA0-001 exam structure, covering data concepts, mining, visualization, and governance. You will face questions on database structures, data quality dimensions, statistical analysis, and dashboard creation. Each scenario tests your ability to apply analytics concepts to business problems. The detailed explanations turn each practice attempt into a learning opportunity. By identifying which topics need deeper study—whether data manipulation or reporting best practices—You will target your preparation efficiently. Walk into your certification exam knowing exactly where you stand.

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