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3. (5 points) A sample of 43 Columbia University students reported they sleep on average 6.68 hours in a weeknight. The sample standard deviation was

3. (5 points) A sample of 43 Columbia University students reported they sleep on average 6.68 hours in a weeknight. The sample standard deviation was 0.78 hours. Calculate a 90% confidence interval for the mean number of hours students at Columbia University sleep in a weeknight.

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