A multiple regression model has for predicted heart rate is as follows: heart rate = 10 – 0.4 run speed + 12 body weight. As the run speed increases by 1 unit (holding body weight constant), heart weight is expected to increase by how much?
0.4
RATIONALE: As the run speed increases by 1 unit (holding body weight constant), heart weight is expected to decrease by 0.4 units. This is the case because the coefficient on the only term that is changing is 0.4 . All other terms remain constant.
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