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Unformatted text preview: Selection & Assignment • Participant Selection – General population – Target population – Accessible population • Sampling – Representative sample – Random sampling – Stratiﬁed random sampling – Ad hoc samples (Convenience sampling) • Participant Assignment – Free random assignment (Large samples) – Matched random assignment (Small samples) • Control Through Experimental Design Control Posttest No Treatment Pretest Control Condition Posttest Treatment Pretest Experimental Condition...
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- Fall '09