Chapter 4.1, Problem 4.25E

(a)

To determine

To construct the scatterplot with the help of your calculator and identify the explanatory variable.

Explanation of Solution

The scatterplot of the data is as follows:

  

Either variable can be the explanatory variable, it does not matter.

(b)

To determine

To describe the form, direction and the strength of the relationship between them and identify any clear outliers.

Explanation of Solution

Bu looking at the scatterplot of the MA angle and HAV angle, we can say that the relation is a positive association (slopes upwards), weak (points lie fat apart) and non-linear (points do not follow a line). And there are not any clear outliers.

(c)

To determine

To explain the correlation of the MA and HAV angle.

Explanation of Solution

The correlation of them is $0.3$ .

It shows that the HAV angle and MA angle are moderately correlated.

(d)

To determine

To explain do we think the data confirms the doctors’ speculation.

Explanation of Solution

We do not think that the data confirms doctors’ speculation because there is no strong correlation as they thought there was.