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MMLU / Which of the following is the primary difference between an experiment and an…

Problem

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question

Which of the following is the primary difference between an experiment and an observational study?

choices

  1. Experiments are only conducted on human subjects; observational studies can be conducted on nonhuman subjects.
  2. In an experiment, the researcher manipulates some variable to observe its effect on a response variable; in an observational study, he or she simply observes and records the observations.
  3. Experiments must use randomized treatment and control groups; observational studies also use treatment and control groups, but they do not need to be randomized.
  4. Experiments must be double-blind; observational studies do not need to be.

subject

high_school_statistics

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