This question is still troubling me This question is still troubling me Image transcription text8. California Speeding. A simple random sample of 40 recorded speeds (in mph) is obtained from cars travelingon a section of Highway 405 in Los Angeles. The sample has a mean of 68.4 mph and a standard deviation of5.7 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greater t… Show more… Show more MathStatistics and Probability MATH 227
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