Chapter 4.1, Problem 4.8E

(a)

To determine

To construct the scatterplot that displays the relationship between average crawling age and average temperature.

Explanation of Solution

The scatterplot that displays the relationship between average crawling age and average temperature is as follows:

  

(b)

To determine

To describe the direction, strength and form of the relationship and conclude about when babies learn to crawl.

Explanation of Solution

Since the scatterplot slopes downwards, the graph has a negative association which seems to be weak (points lie far from each other). The scatterplot also shows a linear relationship, because there is no strong curvature in the scatterplot.