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Final Exam Sample Problems

# Final Exam Sample Problems - Sample Problems for the Final...

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Sample Problems for the Final Exam (Ch. 14, 15, 21 and 22) Statistics 110, Spring 2009 Page 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* x r 2 = 0.604 Scatterplot of Weight and Exercise Capacity 13 18 23 28 33 120 140 160 180 200 220 240 260 Weight (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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