A sample of size 150 is to be used to test the hypotheses H0:mu=8.3 vs. Ha:mu no
ID: 3160473 • Letter: A
Question
A sample of size 150 is to be used to test the hypotheses
H0:mu=8.3 vs. Ha:mu not equal 8.3
where, mu is the true average weight of a newborn American baby. Give the appropriate rejection region associated with 0.05 significance level.
Reject H0 if z > 1.28 or z < -1.28
Reject H0 if z > 1.96 or z < -1.96
Reject H0 if z > 2.575 or z < -2.575
Reject H0 if z > 1.645 or z < -1.645
A.Reject H0 if z > 1.28 or z < -1.28
B.Reject H0 if z > 1.96 or z < -1.96
C.Reject H0 if z > 2.575 or z < -2.575
D.Reject H0 if z > 1.645 or z < -1.645
Explanation / Answer
It is a two tailed test.
The critical values for 0.05 level are -1.96 and 1.96.
Thus the rejection region is:
B. Reject H0 if z > 1.96 or z < -1.96
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