\fto discover percentage / proportion between two X values 1. Convert each X to 2 score 2. Find appropriate area {body or tail} for each 2 score 3. Subtract or add areas as appropriate 4. Change area to % (area x 100 = 9%) Regression lines {central tendency line for all (2 x (E y) points; used for predictions Y = bx + a b _ 2 KY _ T only) formula uses raw (plug in x 2 x2 _ gzxlz scores to predict y) n b = slope a = My ' be a = y-intercept where M... is mean ofy and MX is mean of x SE25: [measures accuracy of predictions; same properties as standard deviation) Pearson Correlation Coefcient {used to measure relationship; uses 2 scores) ny_ (saucy) (>() degree It 8: y vary together :- = degree x 82 y vary separately r2 = estimate or 96 of accuracy of predictions Table of Calculations Pearson Correlation 0') m _ (Exam (2x2 (2:)2)(2y2 _ (23"?) depend on Slope (b) Means 2 xy_(2x11(2y) Mi = 2_ (2 My = 3?? Linear Regression formula: y-intercept (a) Y = bx + a