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Question: in order to estimate the mean amount of time computer...

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In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90% confident that your sample mean is within 10 minutes of the population mean? assume that the standard desviation of monthly time spent on the internet is 192 min. what is a major obstacle to getting a good estimate of the population mean? use technology to find the estimated minimum required sample size.

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