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Doctors believed that patients who received heart pacemakers seemed to snore less. Among 40 randomly selected...

Doctors believed that patients who received heart pacemakers seemed to snore less. Among 40 randomly selected patients with a pacemaker, 12 snored. Among 60 randomly selected patients without a pacemaker, 25 snored. Which of the following statements is NOT correct?

I. The evidence supports the theory at the 10% level.

II. The 95% confidence interval for the difference between the proportion of those who snore in the two groups is (-0.31, 0.07).

III. Since the confidence interval contains 0, there is a significant difference between the two proportions.

a. I only

b. II only

c. III only

d. I and III

e. I, II, and III are correct

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

for hypothesis test:

for confidence interval:

since p value >0.10 we fail to reject the null. 95% CI = -0.31 ,0.07 ,

option B is correct: II only

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