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Choosing between a Z and T test

You are concerned about wait times at the cash registers in the supermarket. You collect data and have a sample size of 10, which test would you use a Z or a T test and why? What is the major difference between a Z and a T test. (hint sample size and variability)

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You are concerned about wait times at the cash registers in the supermarket. You collect data and have a sample size of 10, which test would you use a Z or a T test and why?

WE ...

Solution Summary

The solution explains how to choose between a Z and a T test.

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