There was no difference in crime rates between students who attended "head start" programs and those who did not.
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Q31: _ is a threat to internal validity
Q32: A type of reactivity and threat to
Q33: To make a causal inference from an
Q34: Experimental research is fairly common now in
Q35: The act of randomly assigning research subjects
Q37: Crime control occurs whenever a child is
Q38: Statistical regression is a problem of extreme
Q39: Internal validity is the ability to generalize
Q40: The measurement of a variable before the
Q41: Instrumentation refers to when a problem of
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