CompTIA DA0-002: CompTIA Data+

Last checked October 22, 2026 against the official CompTIA exam page.

1. Question 1Data Analysis

   A business wants to know whether a new promotion increased average weekly sales compared with the previous period. Which statistical test is most appropriate for comparing two period means?

   1. AA t-test for comparing means
   2. BA chi-square test of independence only
   3. CA cluster analysis
   4. DA word cloud
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   Correct answer: A

   A t-test compares the means of two groups or periods to assess whether the difference is likely real. Chi-square tests relate to categorical counts, clustering finds groups, and word clouds do not test differences.

2. Question 2Visualization and Reporting

   A report must show how a metric changed over the last 24 months. Which chart type is most appropriate?

   1. AA pie chart with 24 slices
   2. BA line chart
   3. CA map of the world
   4. DA table with no trend indicator
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   Correct answer: B

   Line charts show change over continuous time clearly. Pie charts with many slices are hard to read, maps show geography, and tables without trend cues hide the pattern.

3. Question 3Data Concepts and Environments

   A retailer stores order records in tables with fixed columns, and the schema is enforced on every row. Which database type does this describe?

   1. AGraph database
   2. BRelational database
   3. CDocument store with no schema
   4. DKey-value store
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   Correct answer: B

   Relational databases store data in tables with defined columns and enforced schemas. Key-value stores, schema-free document stores, and graph databases use different structures.

4. Question 4Data Governance

   A data team must be able to explain where a number in a dashboard came from and how it was transformed. Which concept provides this?

   1. AData deduplication
   2. BData encryption
   3. CData compression
   4. DData lineage
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   Correct answer: D

   Lineage tracks the origin and transformations of data, so the source of each figure can be traced and audited. Encryption protects data, compression reduces size, and deduplication removes repeated records.

5. Question 5Data Acquisition and Preparation

   An analyst must combine customer records from a CRM database with web order data pulled from an API. Which step is the most appropriate first step?

   1. AExport both sources into a printed paper report
   2. BDelete the API data because it has no matching record in the database
   3. CChart each source separately and merge the charts
   4. DIntegrate the sources using a common key such as customer ID
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   Correct answer: D

   Joining on a shared key integrates the two sources into one analyzable dataset. Merging charts or discarding one source does not combine the records.