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OpenStudy (anonymous):
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 15 hours. The population standard deviation is 2 hours. What is the 95% confidence interval for the mean? 14.88−15 hours 14.88−15.12 hours 15−15.12 hours 14.76−14.24 hours
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