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Until this year the mean braking distance of a Nikton automobile moving at 60 miles per hour was 175 feet. Nikton engineers have developed what they consider a better braking system. They test the new brake system on a random sample of 36 cars and determine the sample mean braking distance (assume the population standard deviation is known to be 21 feet). Compute the 90% confidence interval for the mean braking distance.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9113163

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