Question: Suppose that for two populations that are approximately normally distributed with means and and standard deviations and , you wish to test the hypothesis: H:

Suppose that for two populations that are approximately normally distributed with means and and standard deviations and , you wish to test the hypothesis: H: = versus H: . Discuss how your testing procedure will differ if you assume that the population variances are: Known and equal Known but unequal Unknown and equal Unknown but unequal

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