SUMS OF SQUARES (SS) Set 1 Set 2______ ---------------------------- -------------------------------- _ _ _ _ X X - X (X-X)2 X X - X (X-X)2.

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Presentation transcript:

SUMS OF SQUARES (SS) Set 1 ______ Set 2____________ _ _ _ _ X X - X (X-X)2 X X - X (X-X)  X=35 SS=34  X=35 SS=2 _ _ X=5.00 X = 5.00

Problem of SS DEPENDENT ON SAMPLE SIZE SS = SS=18 MORE VARIABILITY IN THE FIRST ROW DIVIDE BY N-1

STANDARD SCORES Test 1 Test

Z SCORE _ X - X z = s = ---- = X = 20 ; sd = 2.00 z score when raw = = is 1.5 sd < mean 2

COMPARISONS _ _ X = 78 s = 6 X = 62 s = = =

CORRELATION Cog abil (X) Job Perf (Y) Zx Zy ZxZy _  (Z X Z Y )=7.16 Y = 2.26  (Z X Z Y ) / 11 =.6509

REGRESSION EQUATION Y’ = a + bX a = -.848; b =.006 IF SANDY’S CA = 520 PREDICTED JP = (.006)*520 = = 2.27