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Statistics 21 Online
OpenStudy (anonymous):

in order to estimate the mean amount of time computer users spend on the internet each month, how manu computers must be surveyed in order to be 95% confident that your sample mean is within 14 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 225 minutes. What is a major obstacle to getting a good estimate of the population mean?

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