Cook and Campbell outlined threats to internal validity many years ago.
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Q67: Alcohol free Jell-O shots are a placebo.
Q68: Researchers only worry about maturation with the
Q69: Extreme scores moving to the mean on
Q70: The threat of internal validity known as
Q71: Maturation is a change in the researcher's
Q73: Campbell and Stanly outlined threats to internal
Q74: In a single blind student, the researcher
Q75: Regression to the mean is a mathematical
Q76: History is an event beyond the researcher's
Q77: A placebo is an inert substance.
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