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abstract American Psychological Association animals ANOVA assigned B. F. Skinner baseline behavior cognitive psychology computed concepts conducted confounding control group correlation data sets deductive method dependent difference distribution dosage drug ethical evaluate example experiment experimental control experimental designs experimental group experimental research external validity extraneous variables factors Figure frequency group of subjects human hypothesis identify independent variable influence informed consent instrumentation interaction internal investigators Journal laboratory learning limited literature manipulated Mann-Whitney mean measure ment null hypothesis number of subjects observed obtained organism organismic variables participate perception perceptual defense performance placebo population posttest pretest pretest-posttest procedures psychological research random samples random-groups design relationship research area research methods research problem response sampling distribution scale scores selected sequence effects significant small-TV research speed statistical test stimulus subject matter suggested Table task theory three-factor tion treatment groups two-factor Type I error vari variance York