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18 December, 16:13

A study of one thousand teens found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 30 hours. The population standard deviation is two hours.

What is the 95% confidence interval for the mean?

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  1. 18 December, 16:47
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    D The confidence limits are 30 plus or minus 1.96 (2/square root of 1000) = 29.88 and 30.12
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