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Unformatted text preview: 59 . 97 45000 − = .7115 s y = 1 7 70000 − =108.012 The correlation between the two variables equaled .7115. 3) A developmental psychologist wants to know if IQ can be predicted using birth weight. She randomly samples seven psychology majors at her university and gives them an IQ test. Next, she obtains the birth weight of the students from their hospitals (with permission, of course!). a) Obtain the regression equation for these data. b) Predict IQ using birth weight scores of 4.8 and 6.9. Birth Weight (lbs.) IQ 5.8 122 6.5 120 8.0 129 5.9 112 8.5 127 7.2 116 9.0 130 271 . 7 = x 286 . 122 = y s x = 1.270 s y = 6.8 r = ) 1 7 ( * 7 * 270 . 1 757 . 40 − = .787 [ ] 787 . 27 . 1 8 . 6 1 = b = 4.214 ) 271 . 7 * 214 . 4 ( 286 . 122 − = b = 91.646 ) ( 214 . 4 646 . 91 ˆ x y + = b . ) 8 . 4 ( 214 . 4 646 . 91 ˆ + = y = 111.873 ) 9 . 6 ( 214 . 4 646 . 91 ˆ + = y = 120.723...
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 Spring '08
 GUYER
 Psychology, Normal Distribution, Standard Deviation, birth weight

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