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Three True Experimental Designs
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achieved analysis analysis of variance attitudes Campbell causal classroom comparison confounded Control Group Design correlation covariance Design 15 differences discussion educational research effect of X employed equivalent eral error ex post facto experimental and control experimental control experimental design experimental effect experimental group experimental variable external validity factors gain hypothesis inference interaction effect internal interpretation interviewers involved Latin squares main effect matching maturation measures memory bias ment mental mental Psychology mentation methods Note observers occasions occur Oi and O2 panel study perimental persons plau plausible rival population possible posttest scores present pretest and posttest pretest scores pretest-posttest problem procedures Psychol psychology psychotherapy pupils quasi-experimental designs random assignment randomly regression relevant replication represent research on teaching rival hypotheses sampling selection-maturation settings shift sible social Sources of Invalidity specific statistical Table teachers tests of significance time-series tion trol group true experiment usually