Below is the Minitab display of the scatterplot and regression line for twelve,

Question

Below is the Minitab display of the scatterplot and regression line for twelve, randomly selected adult patients Use the Minitab display to answer questions 16 through 19 The data is the number of hours each patient exercises in a typical week and their pulse rate. Adult Patient Exercise Analysis y 72.81 1.916 x 75 70 65 a. 50 10 12 number of hours 16. A student calculates the linear correlation coefficient and gets -1.25. 16 Which of the following statements correctly explains how you know that the student's calculation is incorrect? a) The value obtained for r cannot be less than-1 b) The value obtained for r cannot be negative. c) The value obtained for r should be +1.25. d) All of the above. A different student claims that the linear correlation coefficient is r = 0.65, Which of the following statements correctly explains how you know that the student's calculation is incorrect? a) The value of r should be closer to +1. b) When the number of hours of exercise increases, pulse rate also increases. c) The slope of the regression line is negative. d) None of the above. 17. 17.- 18. Which of the following is the best estimate for the value of the linear correlation coefficient r? a) ris between-1.0 and-0.5 b) r is between-0.5 and 0 c) r is between 0 and 0.5 d) r is between 0.5 and 1.0 19. Which of the following is the best estimate for the average pulse rate of an adult patient who exercises seven (7) hours in a typical week? a) 49 b) 59 c) 73 d) 86 19.

Explanation / Answer

16.(a) The value obtained for r cannot be less than -1.

17.(c) The slope of the regression line is negative.

18. (a) r is between -1 and -0.5.

19.(b) 59

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