A9. Suppose you wanted to test the hypothesis that the average speed on a highwaywhere the maximum

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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)?

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