Mathematics, 25.07.2019 13:00, icemaniac

Astudy 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 20 hours. the population standard deviation is 2 hours. what is the 95% confidence interval for the mean? 19.88−20.12 hours 19.76−10.24 hours 19.88−20 hours 20−20.12 hours

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Astudy of one thousand teens found that the number of hours they spend on social networking sites ea...