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aggression ANOVA answer approach to hypothesis asked attitudes B. F. Skinner causal chapter cognitive Coke cola conducted confounds construct validity control group correlation course dice discussion dissonance empiricism exactly example expected experimental realism experimenter bias external validity extremely fact figure glorks green sphere H H H highly hypothesis testing idea important independent variable inferential statistics interaction interested internal interval scales intuitive judges judgments kind laboratory laugh track Likert scales logic main effect manipulation mean measure observed paradigm people's Pepsi performance person possible predictions pretty probably problem psychological psychologists quasi-experiments question R. A. Fisher random assignment random sampling randomly ratings ratio scales reason regression reliability reported research findings research participants roll scientific scientists scores self-esteem self-perception theory simple social specific statistical tests survey task techniques tell theory things threat tion topic true experiments typically