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A professional skier was trying to decide whether to use a new racing wax for cross-country...

  1. A professional skier was trying to decide whether to use a new racing wax for cross-country skis. He decided that the wax would be worth the price if he could average less than 55 seconds on a course he knew well, so he planned to test the wax by racing on the course 8 times. His sample of race times found a mean of 53.1 seconds, and standard deviation 7.0 seconds. Is this sufficient evidence he should he buy the wax? Test at a .10 significance level.
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