Question

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 95​% confident that your sample mean is within 11 minutes of the population​ mean? Assume that the standard deviation of the population of monthly time spent on the internet is 197 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.
((1.645*197)/11)^2

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