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A random sample of the number of vacation days taken last year is given below. Assume the number of vacation days is normally distributed. 10

A random sample of the number of vacation days taken last year is given below. Assume the number of vacation days is normally distributed. 10 14 16 12 10 15 18 10 12 12 13 14 Construct the 90% confidence interval for the mean number of vacation days. 11.7 days

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