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Julia enjoys jogging. She has been jogging over a period of several years, during which time...

Julia enjoys jogging. She has been jogging over a period of several years, during which time her physical condition has remained constantly good. Usually she jogs 2 miles per day. During the past year Julia recorded how long it took her to run 2 miles. She has a random sample of 97 of these times. For these 97 times the mean was 15.65 minutes and the standard deviation s=1.75 minutes

Find the margin of error (round to 2 decimal places) and the 90% confidence interval for Julia’s average running time.

math   Statistics-And-Probability   
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