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You want to estimate the mean amount of time internet users spend on Facebook each month....

You want to estimate the mean amount of time internet users spend on Facebook each month. How many internet users must be surveyed to be 90% confident that your sample mean is within 10 minutes of the population mean? Use 210 minutes as an estimate of the population standard deviation.

Please be detailed and thorough!!

Math   Statistics-And-Probability   
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Answer #1

We know, ~ N(0,1)

The margin of error of 90% confidence interval of the population mean is =

Given that, = 10, where, = 1.645, = 210

Thus, solving above, n = 1194 (approximately).

Hence, the required sample size is approximately 1194.

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