In Exercise 8.47 on page 319, we introduced one-sided one-mean z-intervals. The following relationship holds between hypothesis tests and confidence intervals for one-mean z-procedures: For a left-tailed hypothesis test at the significance level ?, the null hypothesis,H0: ? = ?0 will be rejected in favor of the alternative hypothesis,Ha: ? a. Exercise 9.75 ,b. Exercise 9.76

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