At a DUI checkpoint, some cars are stopped at random, but many others are not stopped. Using the terminology of psychological research, the cars that are stopped may be considered a ______ of all of the cars that pass by the checkpoint.
A) sample
B) subset
C) cohort
D) population

Question

Quizplus · Accepted Answer

The cars that are stopped at the DUI checkpoint represent a sample of all the cars that pass by the checkpoint. A sample is a subset of the larger population that is selected to participate in a study or to be observed in some way. In this case, the cars that are stopped are chosen at random to be checked for signs of driving under the influence, while the cars that are not stopped are not observed. Therefore, the stopped cars represent a sample of the larger population of all the cars that pass by the checkpoint.

At a DUI Checkpoint, Some Cars Are Stopped at Random