Solve Problem 9 using the critical region method of testing. Since the sampling distribution of is the normal distribution, you can use critical values from the standard normal distribution as shown in Figure 9-8 or part (c) of Table 3 of the Appendix. Compare your conclusions with the conclusions obtained by using the P-value method. Are they the same?
Table 3

(c) Hypothesis Testing, Critical Values o Level of Significance Critical value zo for a left-tailed test Critical value zo for a right-tailed test Critical values zo for a two-tailed test =0.05 -1.645 1.645 1.96 =0.01 -2.33 2.33 2.58