A9. Suppose you wanted to test the hypothesis that the average speed on a highway—where the maximum legal speed is 55 mph—is not equal to 55 mph (i.e., H0: m 55; H1: m  55). Speed guns are used to...

A9. Suppose you wanted to test the hypothesis that the average speed on a highway—where the maximum legal speed is 55 mph—is not equal to 55 mph (i.e., H0: m 55; H1: m


55). Speed guns are used to measure the speed of 50 drivers, and the mean is found to be 57.0, SD 8.0. What is the calculated value of t for a onesample t test? With a .05 for a two-tailed test, is the sample mean of 57.0 significantly different from the hypothesized mean of 55.0 (i.e., can the null hypothesis be rejected)?