Question: When an experimental group's average is extreme (low or high) at pretest, it will tend be less extreme (more toward center) over time simply because

When an experimental group's average is extreme (low or high) at pretest, it will tend be less extreme (more toward center) over time simply because of the first time was a bit of a fluke. This phenomenon is otherwise known as: Question 17 options: a) Systematic variability. b) The roller coaster effect. c) Demand characteristics. d) Regression to the mean. e) Observer bias

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