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

3.25

2.262

2.821

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

Mean

None of the above

Proportion

Both of the above

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

One-tailed test

Both of the above

Two-tailed test

None of the above

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

Sample

Population

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

Both

T-statistics

None of the above

Z-statistics

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

T-distribution

Z-distribution

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

None of the above

Sample standard deviation, sample size

Population standard deviation, sample size

Can be both

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

F-statistics

Z-statistics

T-statistics

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

Standard deviation, population mean

Standard deviation, sample mean

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

T-distribution

Z-distribution

#11. 1-sample Z-test can be used to perform hypothesis testing for ________?

Both of the above

None of the above

Proportion

Mean

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

Population

Sample

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

Sample standard deviation, sample size

Can be both

None of the above

Population standard deviation, sample size

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

Both

Z-statistics

None of the above

T-statistics

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

Z-statistics

T-statistics

None of the above

Both

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

Population

Sample

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

Standard deviation, population mean

Standard deviation, sample mean

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

Z-score

T-score

#19. 1-sample Z-test can be used to perform hypothesis testing for ________?

Mean

Proportion

None of the above

Both of the above

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

2.576

1.645

1.96

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

Sample

Population

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

Z-distribution

T-distribution

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

Z-score

T-score

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

Z-distribution

T-distribution

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

Both of the above

None of the above

Two-tailed test

One-tailed test

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

Both of the above

None of the above

Mean

Proportion

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

Population

Sample

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

Sample

Population

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

3.25

2.262

2.821

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

Z-statistics

F-statistics

T-statistics

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

Population

Sample

#32. 2-sample Z-test can be used to perform hypothesis testing for ________?

None of the above

Both of the above

Mean

Proportion

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

1.96

2.576

1.645

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

Standard deviation, sample mean

Standard deviation, population mean

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

Population standard deviation, sample size

Can be both

None of the above

Sample standard deviation, sample size

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

Mean

Both of the above

Proportion

None of the above

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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.
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