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A runner wants to know her average mile running time. She records a sample of 19 running times. The sample has a mean of 6.5

A runner wants to know her average mile running time. She records a sample of 19 running times. The sample has a mean of 6.5 minutes with a standard deviation of 0.4 minutes. Construct a 95% confidence interval for the runner's mile running time.

Report the margin of error to three decimal places.

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