77. Recognizing Extreme Values of . Try to put your calculator down for this exercise, and use your recognition of the extreme values of the standard normal distribution to solve it. Suppose we want to test whether the population mean test score differs from 70. The level of significance is undisclosed, but lies somewhere between 0.01 and 0.10. Different samples provided each of the following different values of . Provide conclusions for each.
524
9.3.77
(a) Reject . (b) Do not reject . (c) Reject . (d) Do not reject .