One way to improve effectiveness of random assignment is to

Question

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Starting with a relatively large pool of people increases the chances of obtaining a random and representative sample, which in turn increases the effectiveness of random assignment. Starting with groups that have known preexisting differences or ensuring that all participants are similar in all respects would compromise the randomness of the assignment. Random assignment can be used for both experimental and descriptive research, so option D is not relevant to improving its effectiveness.

One Way to Improve Effectiveness of Random Assignment Is to