Eye anatomy of giraffes. Refer to the African Zoology (Oct.

2013) study of giraffe eye characteristics, Exercise 11.71

(p. 643). Recall that the researchers fit a simple linear regression equation of the form ln 1y2 = b0 + b1 ln 1x2 + e, where y represents an eye characteristic and x represents body mass (measured in kilograms).

a. For the eye characteristic y = eye mass (grams), the regression equation yielded r2

= .948. Give a practical interpretation of this result.

b. Refer to part a above and Exercise 11.71 part

a. Find the value of the correlation coefficient, r, and interpret its value.

c. For the eye characteristic y = orbit axis angle (degrees), the regression equation yielded r2

= .375. Give a practical interpretation of this result.

d. Refer to part c above and Exercise 11.71 part

b. Find the value of the correlation coefficient, r, and interpret its value.