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# A health researcher does a study investigating the effect of exercise on stress levels in college...  A health researcher does a study investigating the effect of exercise on stress levels in college students. Thery measure how much time a person spends exercising each day (in minutes), and the person's stress level. Below are the means, standard deviations, and correlations Time spent exercising per day Stress level x average: 35 average: 5 SD: 5 SD: 1, r -0.45 The researcher wants to use exercise time to predict stress levels (a) Time spent exercising is the.. x-variable y-variable b) Stress level.. x-variable y-variable (c) The r.m.s. error of the line is (circle correct answer): 10.45 x (d) Calculate the r.m.s. error of the regression line predicting stress level from exercise time o.Y9 (e) Cole exercises 10 minutes per day. Predict his stress level (f) Shelby scored at the 87th percentile for daily exercise time. Predict her percentile for stress level 3 I P ag e
8) Melissa scored at the 50 percentile for daily exercise time. Predict her percentile for stress level shelby Who had higher stress levels, Cole or Shelby? Cole Shelby Melissa Who exercised more, Shelby or Melissa? (h) Calculate the regression line in raw score form for this example. Plot it on a separate sheet of paper. Hint: Calculate the slope using the formula for the regression line for raw scores. Then use the slope, the point of averages, and the general formula for a line to calculate the intercept. Slope ??? Point of Averages ????? ntercept ??? Formula for regression line ??? (0) Calculate the regression line in 2-score form for this example. Hint: identify the origin and is example. Hint: identify the origin and intercept to help draw the line 4|Pa g e  #### Earn Coins

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