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OpenStudy (anonymous):
A study of two hundred teens found that the number of hours they spend on social networking sites each week...
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OpenStudy (anonymous):
A study of two hundred teens found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 12 hours. The population standard deviation is 4 hours. What is the margin of error for a 98% confidence interval? 0.122 0.659 0.295 0.313
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