Bookmark 1. The data that represents the scores of an easy exam. would be skewed

Question

Bookmark

1. The data that represents the scores of an easy exam. would be skewed left. Ture/False

2. Rejecting the null hypothesis at 1% level of significance implies the rejection at 5% level significance. True/False

3. The width of the confidence interval for u does not depend on the value of x. Tue/False

4. The margin of error of the confidence interval; at a specified level of confidence gets larger as the sample size increases. Ture/False

5. In order to assess the effects of exercise on reducing cholesterol, a researcher sampled 50 people from a localgym who exercised rgularly and 50 people from the surrounding community who did not exercise regularly. They each reported to a clinic to have their cholesterol measured. The subjects were unware of the purpose of the study, and the technician measuring the cholesterol was not aware of whether subjects exercised regularly or not. That is:

a. An observational study.

b. An experiment, but not double-blind experiment.

c. A double-blind experiment.

d. A matched pairs experiment.

i. a)yes; b)yes; c)yes

ii. a)yes; b)yes; c)no

Explanation / Answer

Answer:

Bookmark

1. The data that represents the scores of an easy exam. would be skewed left. Ture/False

False

2. Rejecting the null hypothesis at 1% level of significance implies the rejection at 5% level significance. True/False

True

3. The width of the confidence interval for u does not depend on the value of x. Tue/False

False

4. The margin of error of the confidence interval; at a specified level of confidence gets larger as the sample size increases. Ture/False

False

5. In order to assess the effects of exercise on reducing cholesterol, a researcher sampled 50 people from a local gym who exercised regularly and 50 people from the surrounding community who did not exercise regularly. They each reported to a clinic to have their cholesterol measured. The subjects were unaware of the purpose of the study, and the technician measuring the cholesterol was not aware of whether subjects exercised regularly or not. That is:

a. An observational study.

b. An experiment, but not double-blind experiment.

Answer: c. A double-blind experiment.

d. A matched pairs experiment.

6. A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who recommend brand Z is less than 90%, a random sample of doctors was taken. Suppose the test statistic is z=-1.95. Can we conclude that H0 should be rejected at the a) =.10, b) =.05, and c) =.01 level?

i. a)yes; b)yes; c)yes

Answer: ii. a)yes; b)yes; c)no

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