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The effect of the time of day a science class is taught on test scores is being studied in an experiment. Dividing the students in

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The effect of the time of day a science class is taught on test scores is being studied in an experiment. Dividing the students in the experiment into groups based on who teaches their science class is an example of which experimental design principle? A. Replication B. Blocking C. Randomization D. Direct control

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