DataX Practice Test: Can You Pass DY0-001?

1. Which of the following is a key responsibility of a data steward?

Ensuring proper data usage, quality, and compliance within assigned domains

Writing all software code for analytics applications

Managing the physical hardware infrastructure

Designing all user interface elements

2. Which of the following is a key principle of data privacy regulations like GDPR?

Individuals have rights to know what personal data is collected and how it is used

Organizations can collect any data without restrictions

Data should never be encrypted

Privacy policies are optional for all businesses

3. In statistical analysis, what does 'standard deviation' measure?

How spread out data values are from the mean

The most frequently occurring value

The number of rows in a dataset

The total sum of all values

4. What is the primary benefit of implementing data lineage tracking?

Understanding the origin, movement, and transformation of data through systems

Automatically deleting outdated records

Increasing the size of the database

Eliminating the need for data backups

5. Which visualization would best show how a company's market share has changed over five years?

Line chart

Pie chart

Heatmap

Scatter plot

6. In database design, what is a 'primary key'?

A unique identifier that distinguishes each record in a table

The first column in any database table

A password required to access the database

A backup copy of all table data

7. What is the primary goal of data classification?

Organizing data by sensitivity level to apply appropriate security and access controls

Deleting unnecessary data from systems

Converting all data to a single format

Reducing the total amount of stored data

8. Which of the following best describes 'big data'?

High volume, velocity, and variety of data that traditional tools struggle to process

Any dataset larger than 1 gigabyte

Only unstructured information

Data stored in a single database

9. In data analytics, what does 'outlier' refer to?

A data point that significantly differs from other observations in a dataset

The most common value in a dataset

The middle value when data is ordered

A type of data storage format

10. What is a data warehouse primarily used for?

Centralized storage of integrated data from multiple sources for analysis and reporting

Processing real-time transactional data

Encrypting sensitive customer information

Creating user interface designs

11. Which of the following best describes the primary purpose of data governance?

Ensuring data accuracy, security, and compliance across an organization

Maximizing storage capacity on company servers

Eliminating all structured data from databases

Creating larger datasets for analysis

12. What is the primary purpose of data profiling?

Examining data to understand its structure, content, and quality issues

Encrypting sensitive information in databases

Creating backup copies of all datasets

Sorting data in alphabetical order

13. Which data mining technique is used to identify hidden patterns in large datasets?

Clustering

Data validation

Schema design

Data compression

14. In statistical analysis, what does a correlation coefficient measure?

The strength and direction of a linear relationship between two variables

The average value of a dataset

The total number of data points collected

The range between minimum and maximum values

15. What does 'data quality' primarily refer to?

The degree to which data is accurate, complete, and reliable for its intended use

The physical size of the database

The speed at which data can be retrieved

The encryption level applied to stored data

16. Which of the following is an example of unstructured data?

Customer email messages and social media posts

Employee payroll records in a spreadsheet

Transaction data in a relational database

Inventory counts in a CSV file

17. What is a primary benefit of normalizing data in a relational database?

Reducing redundancy and improving data integrity

Increasing query execution speed

Eliminating the need for backups

Allowing unlimited data storage

18. Which visualization type is most appropriate for showing the distribution of a single continuous variable?

Histogram

Pie chart

Scatter plot

Bar chart

19. In data management, what does ETL stand for?

Extract, Transform, Load

Evaluate, Test, Locate

Encrypt, Transmit, Link

Extract, Transmit, Label

20. What is the main difference between descriptive analytics and predictive analytics?

Descriptive explains what happened; predictive forecasts what may happen

Descriptive is faster than predictive analytics

Predictive uses only historical data while descriptive uses current data

Descriptive analytics requires more computing power