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A university with a high water bill is interested in estimating the mean amount of time that students spend in the shower each day. In a sample of 19 students, the average time was 5.09 minutes and the standard deviation was 0.95 minutes. Using this sample information, construct a 99% confidence interval for the mean amount of time that students spend in the shower each day. Assume normality.
What is the lower limit of the 99% interval? Give your answer to three decimal places.
What is the upper limit of the 99% interval? Give your answer to three decimal places.
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