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acceptable actually analysis analysis of variance answer apply arguments average believe biases categorized variables cause chapter Chpt concern conclusions confidence interval consider correlation criteria depends determine discussed distortion drug effect evaluation example expectations experiment experimental factor analysis factors factual accuracy factually accurate female given Hawthorne effect identify important inches independent variable inferential statistics interpret interviewers journal article judge level of measurement literature review male mean measure of association measuring instrument methods noise null hypothesis observation occur operational definitions percent percentage percentile personal space potential predict pretest probably problem statement questionnaire QUESTIONS TO ASK random error random sampling readers of research reason regression reliability replications research findings research report researcher's rival explanations scale scientists significance test situation social sciences specific statistical inference subjects summary tion topic treatment usually validity variance