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a. In testing one mean, the value of what parameter is stated in the null and alternative hypotheses?

b. In testing one mean, what is implied by the null and alternative hypotheses?

 c. Why are non-directional (two-tailed) rather than directional (one-tailed) alternative hypotheses predominantly used in research studies?

 d. What are the similarities and differences between the formula for the z-score (Chapter 5) and the z-test for one mean?

e. Under what conditions would one calculate the population standard error of the mean rather than the standard error of the mean?

 f. What two factors influence the amount of variability in a distribution of sample means?


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