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Dr. Devries is interested in measuring how practice in problem solving affects this ability. The population of interest is high school seniors, and the sample consists of students who attend an exclusive college preparatory school. Half of the sample receives practice in solving particular types of problems, while the other half does not. Both groups take the same problem-solving test. Which of the following might best explain why dr. Devries may not be able to generalize his findings?.
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Dr. Devries is interested in measuring how practice in problem solving affects this ability. The pop...
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