(See Solution) Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one
Question: 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 \({{\sigma }_{1}}\) and \({{\sigma }_{2}}\) ? (6 pts)
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