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