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able abstract actually agency American Chemical Society American Psychological Association answer basic black checkers cause cause-effect chapter collecting data copies correlation coefficient course data collection define dependent variable describe descriptors devices earthworms effect example format identified inferences instrument interac interferon interpretation kind Lake Charles limonene literature search locate looking materials measure notes null hypothesis observed obtain operational definitions original Oscar Lewis paper polystyrene population possible predict prenatal nutrition probably problem area problem statement procedures published Q-sort question readers recording reject the null relationship research hypothesis research problem research project research proposal research report sample score serendipity significance situation solve sources specific statistical suggest techniques tell theory thesis or dissertation tion Type II error underlying hypothesis validity and reliability variable zinc