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4. You want to estimate the amount of time college students spend on facebook each month....

4. You want to estimate the amount of time college students spend on facebook each month. How many college students must be surveyed in order to be 95% confident that your sample mean is 15 minutes of the population mean? Based on results from a prior Nielsen survey, assume that the standard deviation of the population of monthly time spent on facebook is 210 minutes.

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population standard deviation=210

Margin of error=15

z=1.96 for 95% confidence level

Sample size required,n=1.96^2*210^2/15^2=752.95

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