Chapter 4.1, Problem 4.19E

(a)

To determine

To describe the direction, form and strength of the scatterplot given in the question.

Explanation of Solution

By looking at the scatterplot we can say that, the relationship seems to have a positive association (slopes upwards), strong (points are close together) and quadratic (shape of a parabola).

(b)

To determine

To describe in what way these three unusual points different.

Explanation of Solution

A (hippopotamus) is unusual because of its long life span and average gestation.

B (giraffe) is unusual for its short life span and long gestation.

C (Asian elephant) is unusual for its long life span and long gestation.

(c)

To determine

To explain if we were to add a point for humans on the plot then will it be a part of general pattern or a part of unusual point.

Explanation of Solution

If we were to add a point for humans on the plot then it would be an unusual point, because humans have an extremely long life span (compared to the given animals).