How many students must be randomly selected to estimate the mean weekly earnings of
students at one college? We want 95% confidence that the sample mean is within $5 of the
population mean, and the population standard deviation is known to be $63.
The sample size needed to be
% confident is at least

How many students must be randomly selected to estimate the mean weekly earnings of students at one college We want 95 confidence that the sample mean is within class=