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21. A sample of 35 teenagers is chosen. The average amount of sleep they obtain per night is 7.6 hours. Assume o = 0.7 hours.

21. A sample of 35 teenagers is chosen. The average amount of sleep they obtain per night is 7.6 hours. Assume o = 0.7 hours. Find a 95% confidence interval for the mean amount of sleep a teenager obtains per night

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