COMM 291 Chapter Notes - Chapter 6: Sophomore Slump, Standard Deviation, Scatter Plot
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COMM 291 Full Course Notes
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Correlation conditions: quantitative variables condition: correlation applies only to quantitative variables, linearity condition: measures the strength only of the linear association, outlier condition: unusual observations can distort the correlation and make a small correlation look big. Lurking variable: affecting both of the variables observed. Residual: line that comes closer to all the points than any other line. Slope and intercept of the least squares line: correlation strength of the linear association the standard deviations units mean --< where to locate the line b1 = r sy/sx. Y = rzx for every standard deviation we deviate form the mean in x, we predict. The (cid:498)sophomore jinx(cid:499) in professional sports: a player who has a brilliant that y will be r standard deviations away from the mean in y. The cover of sports illustrated jinx: an athlete who makes the cover of sports rookie performance is not quite as brilliant the second year illustrated magazine experiences a drop in performance.
