Suppose you are testing the following hypotheses: H0: = 1000 (The population mean is 1000.) Ha: ≠ 1000 (The population mean is not 1000.) Sample size is 81. The sample mean is 975. The population standard deviation is 90. The significance level is .05.
a. Compute the sample statistic, z stat.
b. Compute the appropriate p value for the sample mean.
c. Should you reject the null hypothesis? Explain.