Xiao Ming finds that the heavier a person is, the higher his pulse rate tends to be. A linear regression model he built suggests that 20-kilogram differences in weight corresponds to differences in pulse rate of 5 beats per minute. Which of the following must be true?

(I) The correlation coefficient between body weight and pulse rate is 1/4.

(II) Your pulse rate slows down 3 beats per minute if your weight decreases by 12 kilograms

MCQ

a) Neither (I) nor (II)

b) (II) only

c) Both (I) and (II)

d) (I) only.