Homework Answers
a)
H0: 
= 27300
Ha:
27300
b)
Criitcal value at 0.01 significance level with 19 df = 
2.861
Decision rule = Reject H0 if t < -2.861 OR t > 2.861
c)
Test statistics
t = (
-
) / ( S / sqrt(n) )
= ( 28500 - 27300) / (9651 / sqrt(20) )
= 0.56
d)
Since test statistics falls in non-rejection region, fail to reject H0.
Fail to reject H0. This data agree with the United Nations report.
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