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

Question

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

1. As test is easy mostly all the score would be right side hence skewed left side so answer is True.

2. No as if pvalue is 0.04 so we will reject it for alpha=0.05 but for 1% it becomes greater than alpha.=0.01 so we do noy reject nulkhypothesis. So answer is False

3.Answer is true as u and x are different

4. As n is indenominator of Margin of error it is reduce as n increases so answer is False

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