The Great Britain Office of Population Census and Surveys collected data on a random sample of 170 married couples in Britain recording the age and heights of the husbands and wives. The scatterplot on the left shows the wife's age plotted against her husband's age, and the plot on the right shows wife's height plotted against husband's height.

Which figure indicates a stronger linear relationship?

Select one:

a.

The couples heights

b.

The couples ages

70 60- 65- Wife's height (in inches) Wife's age (in years) 40 60- 20- 55- 20 40 60 60 65 70 75 Husband's age (in years) Husband's height (in inches)