Z-test MCQs with Answers: Interview Questions

In this blog post, you can test your knowledge about Z-test, Z-statistics and related concepts through multiple choice questions (MCQs) and answers. Getting a good understanding of Z-tests, Z-statistics and Z-distribution is of utmost importance for data scientists at large. The following are key concepts around which the MCQs are posted:

• Z-score or Z-statistics concepts
• Estimation of population mean and proportion
• 1-sample Z-test for mean and proportion
• 2-samples Z-test for mean and proportion

Z-test Interview Questions Samples

The following is a list of interview questions that you would want to learn:

• What is Z-score? Explain with an example and formula.
• What are different types of Z-tests? Explain with formula and examples.
• What is difference between 1-sample and 2-samples Z-test for means? Explain with one example each and formula. 
• What is difference between 1-sample and 2-samples Z-test for proportions? Explain with one example each and formula.
• How do you estimate population mean at 95% confidence interval as a function of Z-score?
• How do you estimate population proportion at 95% confidence interval as a function of Z-score?
• What is standard error? How is it related to margin of error?
• When to use Z-test and when to use T-test?
• What is sampling distribution and how is it related to Z-test and Z-statistics?
• What is Z-distribution? How is this different from T-distribution?
• What is standard score? 
• How can Z-score be used to compare marks of two students in different classes?

Z-test MCQs Quiz: Questions & Answers

The following is a list of questions and answers aimed to test your knowledge of different types of Z-tests, Z-statistics, hypothesis testing etc.

#1. 1-sample Z-test can be used to perform hypothesis testing for ________?

Mean

Mean

Proportion

Proportion

None of the above

None of the above

Both of the above

Both of the above

#2. _______ can be used for hypothesis testing when the sample size is larger than 30

Z-statistics

Z-statistics

T-statistics

T-statistics

F-statistics

F-statistics

#3. Estimating population mean with 95% confidence interval given a sample size of 10 would mean the value of T-score to be _______

2.262

2.262

2.821

2.821

3.25

3.25

#4. Z-test can be used for __________?

Both of the above

Both of the above

None of the above

None of the above

Two-tailed test

Two-tailed test

One-tailed test

One-tailed test

#5. Z-score is used when _________ standard deviation is known?

Sample

Sample

Population

Population

#6. Z-statistics can be used to estimate ________ mean?

Sample

Sample

Population

Population

#7. Estimating population mean with 95% confidence interval would mean the value of Z-score to be _______

1.645

1.645

2.576

2.576

1.96

1.96

#8. Z-score is used when _________ standard deviation is known?

Population

Population

Sample

Sample

#9. _______ will be used for estimating population mean for sample size lesser than 30

Z-distribution

Z-distribution

T-distribution

T-distribution

#10. Standard error is _________ divided by the square root of ________?

Can be both

Can be both

Sample standard deviation, sample size

Sample standard deviation, sample size

Population standard deviation, sample size

Population standard deviation, sample size

None of the above

None of the above

#11. _______ will be used for estimating population mean for sample size greater than 30

T-distribution

T-distribution

Z-distribution

Z-distribution

#12. Standard error is the ___________ of the ___________ in the sampling distribution?

Standard deviation, population mean

Standard deviation, population mean

Standard deviation, sample mean

Standard deviation, sample mean

#13. Z-score is used when _________ standard deviation is known?

Sample

Sample

Population

Population

#14. Z-test can be used to perform hypothesis testing related to sample ________?

None of the above

None of the above

Proportion

Proportion

Mean

Mean

Both of the above

Both of the above

#15. _______ can be used for hypothesis testing when the sample size is larger than 30

F-statistics

F-statistics

T-statistics

T-statistics

Z-statistics

Z-statistics

#16. Z-statistics can be used to estimate ________ mean?

Population

Population

Sample

Sample

#17. ______ is used when population standard deviation is unknown and the sample size is small?

Z-score

Z-score

T-score

T-score

#18. Margin of error can be defined as the function of ________

None of the above

None of the above

T-statistics

T-statistics

Both

Both

Z-statistics

Z-statistics

#19. Z-test can be used to perform hypothesis testing related to sample ________?

None of the above

None of the above

Mean

Mean

Proportion

Proportion

Both of the above

Both of the above

#20. 2-sample Z-test can be used to perform hypothesis testing for ________?

Proportion

Proportion

Both of the above

Both of the above

None of the above

None of the above

Mean

Mean

#21. 2-sample Z-test can be used to perform hypothesis testing for ________?

None of the above

None of the above

Both of the above

Both of the above

Proportion

Proportion

Mean

Mean

#22. Standard error is _________ divided by the square root of ________?

Sample standard deviation, sample size

Sample standard deviation, sample size

None of the above

None of the above

Can be both

Can be both

Population standard deviation, sample size

Population standard deviation, sample size

#23. Standard error is _________ divided by the square root of ________?

Can be both

Can be both

Population standard deviation, sample size

Population standard deviation, sample size

Sample standard deviation, sample size

Sample standard deviation, sample size

None of the above

None of the above

#24. ______ is used when population standard deviation is unknown and the sample size is small?

T-score

T-score

Z-score

Z-score

#25. _______ will be used for estimating population mean for sample size greater than 30

Z-distribution

Z-distribution

T-distribution

T-distribution

#26. Estimating population mean with 95% confidence interval would mean the value of Z-score to be _______

1.645

1.645

2.576

2.576

1.96

1.96

#27. Z-statistics can be used to estimate ________ proportion?

Sample

Sample

Population

Population

#28. _______ will be used for estimating population mean for sample size lesser than 30

T-distribution

T-distribution

Z-distribution

Z-distribution

#29. 1-sample Z-test can be used to perform hypothesis testing for ________?

None of the above

None of the above

Both of the above

Both of the above

Mean

Mean

Proportion

Proportion

#30. Z-statistics can be used to estimate ________ proportion?

Sample

Sample

Population

Population

#31. Standard error is the ___________ of the ___________ in the sampling distribution?

Standard deviation, population mean

Standard deviation, population mean

Standard deviation, sample mean

Standard deviation, sample mean

#32. Margin of error can be defined as the function of ________

T-statistics

T-statistics

Both

Both

None of the above

None of the above

Z-statistics

Z-statistics

#33. Margin of error can be defined as the function of ________

T-statistics

T-statistics

None of the above

None of the above

Z-statistics

Z-statistics

Both

Both

#34. Standard error is the ___________ of the ___________ in the sampling distribution?

Standard deviation, sample mean

Standard deviation, sample mean

Standard deviation, population mean

Standard deviation, population mean

#35. Z-test can be used for __________?

Both of the above

Both of the above

One-tailed test

One-tailed test

None of the above

None of the above

Two-tailed test

Two-tailed test

#36. Estimating population mean with 95% confidence interval given a sample size of 10 would mean the value of T-score to be _______

3.25

3.25

2.262

2.262

2.821

2.821

Finish

Results

Congratulations! You passed the test!

• Author
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Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. I would love to connect with you on Linkedin.
Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking.

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You may try again!

• Author
• Recent Posts

Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. I would love to connect with you on Linkedin.
Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking.

Latest posts by Ajitesh Kumar (see all)

• Completion Model vs Chat Model: Python Examples - June 30, 2024
• LLM Hosting Strategy, Options & Cost: Examples - June 30, 2024
• Application Architecture for LLM Applications: Examples - June 25, 2024

• Author
• Recent Posts

Ajitesh Kumar

I have been recently working in the area of Data analytics including Data Science and Machine Learning / Deep Learning. I am also passionate about different technologies including programming languages such as Java/JEE, Javascript, Python, R, Julia, etc, and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data, etc. I would love to connect with you on Linkedin.
Check out my latest book titled as First Principles Thinking: Building winning products using first principles thinking.

Latest posts by Ajitesh Kumar (see all)

• Completion Model vs Chat Model: Python Examples - June 30, 2024
• LLM Hosting Strategy, Options & Cost: Examples - June 30, 2024
• Application Architecture for LLM Applications: Examples - June 25, 2024