# Role of population standard deviation in hypothesis testing

1.Discuss and compare testing a claim about a mean when:

- the population standard deviation is known

- the population standard deviation is unknown

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1. Population Standard Deviation Known

If the population standard deviation, sigma, is known, then the population mean has a normal distribution, and you will be using the z-score formula for sample ...

#### Solution Summary

This solution compares test claims about a population mean when the population standard deviation is known versus unknown.

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