# Hypothesis Testing : Single mean and difference between two means and standard deviations

Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means? When can the sample standard deviations s 1 and s 2 be used in place of the population standard deviations s 1 and s 2?

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#### Solution Summary

Single mean and difference between two means and standard deviations are discussed. The solution is detailed and well presented.

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