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Activity 1: Critical Values Find the critical values of the following problems: 1. A car manufacturer asserts that with the new collapsible bumper system, the mean body repair cost for the damage sustained in a collision impact of 15 miles per hour does not exceed $500. To test the validity of this claim, 7 cars are crashed into a barrier at 14 miles per hour and their repair costs recorded. The mean and standard deviation are found to be $46.9 and $42, respectively. At the o = 0.05 signicance level, does the test data contradict the manufacturer's claim that the repair cost does not exceed $500