Z-test MCQs with Answers: Interview Questions

Z-test MCQs with questions and answers

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

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

#3. 1-sample Z-test can be used to perform hypothesis testing for ________?

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

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

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

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

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

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

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

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

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

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

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

#15. 2-sample Z-test can be used to perform hypothesis testing for ________?

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

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Ajitesh Kumar
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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. For latest updates and blogs, follow us on Twitter. 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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