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Unformatted text preview: (b) John and Will score 485 and 710, respectively, on the aptitude test. Predict the freshman GPA for each. (c) What assumption is necessary for this prediction to be valid? #2 A researcher was interested in the effect of stress level on the quality of marital interaction. She measured stress level and then observed the number of times a spouse spoke sharply during a two-hour test period, producing an irritability score. The fictional data from 4 participants are as follows: X Y Subject (Stress level) (Irritability) 1 4 10 2 10 15 3 2 7 4 6 7 Mx = 5.5 My = 9.75 Sx = 2.96 Sy = 3.27 r = 0.81 (a) Give the prediction formula for predicting the irritability from stress level (b) Predict the irritability level for someone with a stress level of 9...
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- Winter '10