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Unformatted text preview: Psychology 206 Class Notes 10/22/08 Today: Quiz 2 return Begin chapter 10 Exercise #17 For Friday: Chapter 10 Exercise #17 QUIZ #2 A range 30% A- range 18% B+ range 9% B range 11% B-range 9% C range 14% D range 9% 1bonus half-point for everyone Check for addition errors Correlations Review HOW WOULD YOU GRAPH THESE DATA IN A SCATTER PLOT? X Y 2 5 3 1 8 1 6 1 9 Plot the (x, y) coordinates Label the axes CORRELATION REVIEW -1.00 to +1.00 o Direction Positive Negative o Strength CORRELATION REVIEW Alcohol consumption is correlated with cigarette use HUGE IDEA: o HUGE Just because two things are correlated that one thing CAUSES the other. No random assignment Correlation matrix o The correlation of the variables along the top row to the variables in the vertical column on the left o Variables always correlate perfectly with themselves results in a correlation of one (1) . So we just put a dash instead V1 V2 V3 V1- V2 .28- V3-.89 .62....
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- Fall '07