New York University STAT-UB STAT-UB UB 103 Suppose that 60 internet-users are randomly selected and monitored to see how long each user spends on Facebook daily. The average amount of time
each user spends on Facebook daily. The average amount of time spent on Facebook
among these users turned out to be 40 minutes per day with a standard deviation of 15
(a) Find a Confidence interval for the average amount of time spent on Facebook by
all internet-users which has a confidence level of 99%.
(b) What does the confidence interval in (a) tell us?
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