A survey of 26 college freshmen found that they average 6.85 hours of sleep each night. A
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A survey of 26 college freshmen found that they average 6.85 hours of sleep each night. A 90% confidence interval had a margin of error of 0.497.
a. What are the lower and upper limits of the confidence interval?
b. What was the standard deviation, assuming that the population standard deviation is known?
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a b Sleep Sample mean 685 Alpha 01 ...View the full answer
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