CLP 3140 Lecture Notes - Lecture 4: Twin, Institutional Review Board
Document Summary
Correlational relationships: positive correlation, negative correlation, unrelated correlation. Correlational strength or magnitude: high, low. Perfect positive correlation to perfect negative correlation. Epidemiological studies: reveal the incidence and prevalence of a disorder in a particular population. Longitudinal studies: involve observation of same individuals on many occasions over a long period. Correlational studies of many pairs of twins have suggested a link between genetic factors and certain psychological disorders. Identical twins ( who have identical genes) display a higher correlation for some disorders than do fraternal twins (whose genetic makeup is not identical) Experiment is a research procedure in which a variable is manipulated and the manipulation"s effect on another variable is observed: independent variable, dependent variable. Questions about casual relationships can only be answered by an experiment. Statistics and research design are very important: researchers must try to eliminate all confounds. Three features are included in experiments to guard against confounds: control group, random assignment, bias, blind, and double-blind design.
