Moderate

Subjects are said to be assigned randomly when:

Correct answer: B. they each have an equal chance of being assigned to either the experimental or control group

  • A. they are assigned to experimental and control group from a sample which is representative of the larger population
  • B. they each have an equal chance of being assigned to either the experimental or control group
  • C. they are assigned to experimental and control group so that the group differ on some critical variable before the experiment begins
  • D. neither the experimenter nor the subject knows whether the subject is in the experimental or control group

Explanation

Random assignment means every participant has an equal chance of entering any experimental group, helping distribute individual differences across groups. A representative sample concerns generalisability, not random assignment.

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