A political analyst in Michigan surveys a random sample of registered Democrats and compares the results with those obtained from a random sample of registered Republicans. This would be an example of an experimental design called a paired-difference or matched pairs design.

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A paired-difference or matched pairs design would involve matching individuals within each group based on some characteristic and then comparing the results of the two groups. In this case, the two groups are not being matched or paired in any way, so this is not an example of a paired-difference design.

A Political Analyst in Michigan Surveys a Random Sample of Registered