Question

in order to estimate the mean amount of time computer users spend on the internet each month, how many computers users must be surveyed in order to be 95% confidence that your sample mean is within 13 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 218 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated minimum required samples size. (a) the minimum sample size required is? (b) what is the major obstacle to getting a good estimate of the population mean?

Answer 1

Given,

,

Where, E is the margin of error.

confidence interval = 95%

We know that,

Squaring both side, we have,

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b). The main obstacle to getting a good estimate of the population mean is the margin of error. The less the margin of error will give a good estimate of the population mean.

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