As we mentioned on page 368, the following relationship holds between hypothesis tests and confidence intervals for one-mean z-procedures: For a two-tailed hypothesis test at the significance level ?, the null hypothesis H0: ? = ?0 will be rejected in favor of the alternative hypothesis Ha: ? ? ?0 if and only if ?0 lies outside the (1 ? ?)-level confidence interval for ?. In each case, illustrate the preceding relationship by obtaining the appropriate one-mean z-interval (Procedure 8.1 on page 312) and comparing the result to the conclusion of the hypothesis test in the specified exercise.,a. Exercise 9.74 ,b. Exercise 9.77
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