A study was conducted in order to estimate the mean number

A study was conducted in order to estimate ?, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be ? = 3.6 hours.

Based on this information, what would be the point estimate for ??

A 81

B 8.5

C 3.6

D None of the above.

Solution

Point estimate = adults gives a mean weekly computer usage time and that from prior studies = 8.5 hours