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QUESTION

Which statement best characterizes how random assignment rules out selection threats?

Which statement best characterizes how random assignment rules out selection threats?

Select one:

a. on average, groups can be considered as accurately representing a larger populationb. on average, groups are made maximally different on the pretestc. on average, both groups will exhibit the same amount of regression to the meand. on average, groups are probabilistically equivalent on all pre-study characteristics
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