Posted by anonymous on .
Salaries of 31 college graduates who took
a course in college have a mean, x of
66,700 a standard deviation , o of 17,120, construct a 90% confidence interval for estimating the population
mean u.

stastics 
Kuai,
66700 1.645* 17120/sqrt((31)) =
66700 +1.645* 17120/sqrt((31)) =?
( , )?