Chapter 3.1, Problem 7E

(a)

To determine

To describe: the direction, form, and strength

Answer to Problem 7E

Direction: positive

Form: linear

Strength: moderately strong

Explanation of Solution

Calculation:

Put outsource percent (the explanatory variable) on the horizontal axis and delay percent (the response variable) on the vertical axis. Figure $7.1$ is our completed scatterplot.

  

The graph shows a positive direction: the overall pattern moves from lower left to upper right. That is, states in which students with higher outsource percent tend to have higher delay percent. This refers to positive association between the two variables. The form of the relationship is linear. The graph follows a straight line pattern . The relationship is moderately strong because the points don’t deviate greatly from line but there are some outliers.

Conclusion:

Therefore,

Direction: positive

Form: linear

Strength: moderately strong

(b)

To determine

To find:the airlines which are a high outlier in delay percent and explain the plot which shows a roughly linear form and the relationship is strong or not

Answer to Problem 7E

This is Hawaiian airline is a high outlier in delay percent

The overall pattern follows a straight line from lower left to upper right. The relationship is not very strong because the points deviate greatly from line and there are some outliers.

Explanation of Solution

The airline with delay percent $70$ is a high outlier. This is Hawaiian airline. The overall pattern follows a straight line from lower left to upper right. The relationship is not very strong because the points deviate greatly from line and there are some outliers.