DY0 CompTIA DataX Free Practice Test - 20 Questions

Question 1

Which data governance framework component primarily ensures that data is used in compliance with legal and regulatory requirements?

Accepted Answer

Data compliance

Question 2

Which data quality dimension measures the degree to which data correctly reflects the real-world entity it represents?

Accepted Answer

Accuracy

Question 3

In dimensional modeling, what is a fact table primarily used for?

Accepted Answer

Storing quantitative measurements

Question 4

A company needs to integrate data from multiple sources into a data warehouse with minimal transformation during the loading phase. Which approach is most appropriate?

Accepted Answer

ELT (Extract, Load, Transform)

Question 5

Which database type is most suitable for storing unstructured data such as social media posts and sensor readings?

Accepted Answer

NoSQL database

Question 6

A data analyst needs to share a dataset with external partners while protecting sensitive personally identifiable information (PII). Which technique should be used?

Accepted Answer

Tokenization

Question 7

Which stage of the data lifecycle involves deciding whether to archive or delete data that is no longer actively used?

Accepted Answer

Data disposal

Question 8

A data analyst is assessing a new dataset and finds that 30% of values in a critical field are missing. Which data profiling metric should be reported?

Accepted Answer

Data completeness

Question 9

Which data cleaning technique is most appropriate for handling duplicate records that have slight variations in textual fields?

Accepted Answer

Fuzzy matching

Question 10

When presenting a data visualization to executives, which chart type is most effective for showing the trend of sales over the past 12 months?

Accepted Answer

Line chart

Question 11

A study finds a strong positive correlation between ice cream sales and drowning incidents. What is the most likely explanation?

Accepted Answer

A confounding factor (e.g., hot weather) increases both

Question 12

Which metric is most appropriate for evaluating the performance of a binary classification model when the dataset is highly imbalanced?

Accepted Answer

F1-score

Question 13

A machine learning model trained on historical hiring data shows a tendency to favor male candidates over equally qualified female candidates. This is an example of:

Accepted Answer

Algorithmic bias

Question 14

Which principle of data ethics requires that individuals are informed about how their personal data will be used?

Accepted Answer

Consent

Question 15

Which component of the Hadoop ecosystem is responsible for distributed storage of large datasets across a cluster?

Accepted Answer

HDFS (Hadoop Distributed File System)

Question 16

In a star schema, a table containing product details (product_id, product_name, category) is most likely a:

Accepted Answer

Dimension table

Question 17

Which data mining technique groups customers into segments based on purchasing behavior without predefined labels?

Accepted Answer

Clustering

Question 18

A data analyst is presenting a complex analysis to non-technical stakeholders. Which approach best conveys the key insights?

Accepted Answer

Focus on a clear narrative with visualizations

Question 19

Which data quality metric measures the percentage of records that contain no missing values across critical fields?

Accepted Answer

Completeness

Question 20

Which role is typically responsible for defining data standards and policies across an organization?

Accepted Answer

Data owner

DY0 CompTIA DataX Free Practice Test - 20 Questions

The free lane is only the front row