Time for bed. How much do Americans sleep each night? based on a random sample of 1120 Americans 15 years old or older, the mean amount of sleep per night is 8.17 hours according to the American Time Use Survey conducted by the bureau la Labor Statistics. Assuming the population standard deviation for the amount of sleep per night is 1.2 hours, construct and interpret a 95% confidence interval for the mean amount of sleep per night of Americans 15 years of age or older.

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