Use the following to A survey was designed to study of a were classified as smal

Question

Use the following to A survey was designed to study of a were classified as small, medium, and large. Questionnaires of each size y how the operations of a group of businesses vary with their size. Companies were sent to 200 randomly selected businesses , for a total it was decided to examine turned, of 600 questionnaires. Since not all questionnaires in a survey of this type are re are given in the following two-way table: whether the response rate varied with the size of the business. The data Size Re Small Medium 120 80 40 Respon 80 120 160 Total 200 200 200 Large at percentage of all small companies receiving questionnaires responded? A) 50.0% B) 20.0% C) 60.0% D) 33.3% At a large University a simple random sample of 5 female professors is selected and a simple random sample of 10 male professors is selected. The two samples are combined to give an overall sample of 15 professors. The overall sample is A) a simple random sample B) biased due to imbalance. 17. C) a stratified sample. D) all of the above 18. Which of the following are principles of experimental design? B) replication A) biasing C) segmentation D) all of the above 19. Two variables in a study are said to be confounded if A) one cannot separate their effects on a response variable. B) they are highly correlated. C) they do not have a normal distribution. D) one of them is a placebo. Use the following to answer question 20: One hundred volunteers who suffer from agoraphobia are available for a study. Fifty are selected at random and are given the drug imipramine, which is believed to be effective in treating agoraphobia. The other 50 are given a placebo. A psychiatrist evaluates the symptoms of all volunteers after two months to determine if there has been substantial improvement in the severity of the symptoms. 20. This study would be double blind if A) neither drug had any identifying marks on it. B) neither the volunteers nor the psychiatrist werc allowed to see each other during the session during which the psychiatrist evaluated the severity of the symptoms. C) neither the volunteers nor the psychiatrist knew which subjects had received the placebo. D) all of the above 21. A researcher conducts a study to investigate the effect of exercise and diet on mood. The factors in this study are A) whether randomization and placeboes were used. B) whether the experiment was double blind. C) the number of subjects. D) exercise and diet. Page 3

Explanation / Answer

16. Percentage of small companies receiving quetionnaire responded = 120/200 = 60.0%

Option C is correct.

17. Option C is correct.

18. Option B is correct.

19. Option A is correct.

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