Guidelines for the Jolly Blue Giant Health Insurance Company say that the averag
ID: 3371487 • Letter: G
Question
Guidelines for the Jolly Blue Giant Health Insurance Company say that the average hospitalization for a triple hernia operation should not exceed 30 hours. A diligent auditor studied records of 16 randomly chosen triple hernia operations at Hackmore Hospital, and found a mean hospital stay of 40 hours with a standard deviation of 20 hours. "Aha!" she cried, "the average stay exceeds the guideline." The p-value for a right-tailed test of her hypothesis is:
less than .01.
between .025 and .05.
between .01 and .025.
between .05 and .10.
Explanation / Answer
Sol:
H0:mu=30
H1:mu>30
alpha=0.05
t=sample mean-pop mean/sample sd/sqrt(n
=40-30/20/sqrt(16)
=10/2
t=2
df=n-1=16-1=15
p=0.032
P<0.05
between .025 and .05.
OPTION B
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