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9. А simple random sample of 40 recorded speeds in miles per hour is obtained from...

9. А simple random sample of 40 recorded speeds in miles per hour is obtained from cars traveling on а section of Highway 405 in Los Angeles. The sample has а mean of 68.4 miles per hour and а standard deviation of 5.7 miles per hour. Use а 0.05 significance level to test the claim that the mean speed of all cars is greater than the posted speed limit of 65 miles per hour.

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