We observe this relationship in adults:
Weight = -20 + 30 height + 2 height^2
Which statement is true?
A. Each additional foot of height is associated with 30 pounds more of weight.
B. Each additional foot of height is associated with 34 pounds more of weight.
C. On average, 6-foot tall people weigh 32 pounds more than 5-foot tall people.
D. On average, 6-foot tall people weigh 52 pounds more than 5-foot tall people.
Answer: D. On average, 6-foot tall people weigh 52 pounds more than 5-foot tall people.