SOLUTION: To estimate the average annual expenses of students on books and class materials a sample of size 100 is taken. The average is $250 and the standard deviation is $40. A 99% confi

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Question 312605: To estimate the average annual expenses of students on books and class materials a sample of size 100 is taken. The average is $250 and the standard deviation is $40. A 99% confidence interval for the population mean is?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
N=100
sigma=40
alpha=0.01
.
.
.
DELTA=2.58%2Asigma%2Fsqrt%28N%29
DELTA=2.58%2A40%2Fsqrt%28100%29
DELTA=10.3
.
.
.
(239.7,260.3)