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Select the studies below that use a matched pairs experimental design. (a).To determine the effect of...

Select the studies below that use a matched pairs experimental design.

(a).To determine the effect of wearing a helmet in a motorcycle accident, recent accident reports are collected. The reports are divided into two groups, those who were wearing a helmet at the time of the accident and those were were not. The difference of the mean severity for the two groups is computed.

(b).A study is designed to test which of two new methods is better at teaching children in first grade to read. Children in first grade are selected at random and are paired together based on reading ability. One student is taught with one method, and the other is taught with another method.

(c).A scientist seeks to compare the water resistance of a new sports bandage against a non-sports bandage made by the same company. Half of the subjects are randomly assigned to get the new sports bandage on one elbow, and the other half gets the non-sports bandage on one elbow.

(d).A scientist seeks to compare the water resistance of a new sports bandage against a non-sports bandage made by the same company. The new sports bandage is placed on a randomly chosen elbow of each subject, and the non-sports bandage is placed on the other.

(e).Participants in a study to determine the effects of a new respiratory medication are divided into groups based on gender. Participants within each group are randomly assigned the treatment or a placebo to compare the results.

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