The scatterplots below show the relationship between height, diameter, and volume of timber in 31 felled black cherry trees. The diameter of the tree is measured 4.5 feet above the ground. 70- Volume (in cubic ft) 40 10- 65 75 85 Height (in ft) 70- Volume (in cubic ft) 40 10- 12 16 20 Diameter (in inches) a) Describe the relationship between height and volume of these trees. strong, positive O weak/moderate, positive b) Describe the relationship between diameter and volume of these trees. O weak/moderate, positive O strong, positive c) Suppose you have height and diameter measurements for another black cherry tree. Which of these variables would be preferable to use to predict the volume of timber in this tree using a linear regression model? O diameter O height