9.28. Refer to the previous exercise. Now let the percentage using contraceptives be the explanatory variable for predicting fertility. Using software with the data at the text Web site,

(a) Construct a stcm-and-lcaf plot or box plot for fertility, and describe its distribution.

(b) Construct a scatterplot. Does a linear model seem appropriate?

(c) Fit the model, and interpret the parameter estimates.

(d) Can you compare the slopes of the prediction equations with the two predictors to determine which has the stronger effect? Explain.

(e) Which variable, contraceptive use or women's economic activity, seems to have the stronger association with fertility? Explain.