Sample Problems for the Final Exam (Ch. 14, 15, 21 and 22) Statistics 110, Spring 2009Page 1 of 5 Questions 1 – 6 are based on the following description: For a group of military inductees, the weight, x, and exercise capacity, y, were recorded for ten individuals. Use the output and scatterplot below to answer the following questions. Regression line: y= 44.9 – 0.11*xr2=0.604Scatterplot of Weight and Exercise Capacity1318232833120140160180200220240260Weight (pounds)Exercise Capacity (# of sit-ups)1.What percent of the variation in exercise capacity is explained by a relationship with weight? A)11% B)77.7% C)60.4% D)44.9% 2.What is the value of the linear correlation coefficient? 3.Describe the form, direction, and strength of the relationship between the two variables.
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