In a sample of 20 software developers the mean length of the

In a sample of 20 software developers, the mean length of the work week is 50 hours, with standard deviation 10 hours. What is the 99% confidence interval for the average work week in the software development trade?

Solution

Sample size n = 20

Mean length of work mu = 50 hours

std dev = 10 hours

Std error = 10/rt 20

Margin of error = 2.58(std error) =