Matching is another procedure that can be used as a substitute for randomization.
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Q34: Carrington and Schulenberg's (2008) study of the
Q35: A type of contamination in experimental and
Q36: If researchers were evaluating the effectiveness of
Q37: The random assignment of subjects to experimental
Q38: When subjects experience a treatment that wasn't
Q40: A source of internal (causal) invalidity occurring
Q41: Selection bias is when subjects develop or
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Q43: Time Series designs include several pretest and
Q44: In longitudinal research designs, data are collected
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