Basic Principles of Experimental Psychology |
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abstract American Psychological Association animals ANOVA antecedent anxiety APA style assigned called computed concepts conducted confounding Conservatives control group correlation data sets defined difference distribution dosage ethical evaluate example experiment experimental control experimental designs experimental group experimental research external validity extraneous variables F statistic factors female Figure frequency group of subjects human hypothesis identify independent variable influence instrumentation interaction internal investigators laboratory learning Liberals limited literature review male manipulated Mann-Whitney mean ment null hypothesis number of subjects observed organism organismic variables perceptual defense performance persons placebo population posttest pretest pretest-posttest procedures Psychological Abstracts psychological research random samples random-groups design relationship repeated-measures research area research methods research problem research psychologists response sampling distribution scale scores selected sequence effects significant Social Psychology statistical test stimulus subject matter suggested t-test task tend theory tion treatment groups two-factor Type I error vari variance York