Homework Answers
H0: 
1 =
2 , Ha:
1 
2
Test statistics
t = (
1
-
2 ) / SE
= (375.5 - 378.6) / 0.61865
= -5.01
t critical value at 0.01 level with (72+36-2) = 106 df = -2.326 , 2.326
Since test statistics falls in rejection region,we have sufficient evidence to reject H0.
We conclude that we have enough evidence to support the claim.
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