Question: Tell in each of the following instances whether the study uses an independent sample or a matched pairs design .

1. Two computing algorithms are compared in terms of the CPU times required to do the same six test problems.
2. Lung cancer patients admitted in hospital over a 12 month period are each matched with a non-cancer patient by age, sex, and race. To determine whether or not smoking is a risk factor for lung cancer, it is noted for each patient if he or she is a smoker.
3. A survey is conducted of college bound and non-college bound high school seniors to compare the proportion who have at least one parent who attended college. (College bound means that a person has chosen to go to college after high school).
4. An advertising agency has come up with two different TV commercials for a house-hold detergent. To determine which one is efficient, a test is conducted in which a sample of 100 adults is randomly divided into two groups. Each group is shown a different commercial, and the people in the group are asked to score the commercial.
5. A psychologist measures the response times of subjects under two stimuli: each subject is observed under both the stimuli in a random order.

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