18. Refer to the previous exercise. Now use GNP as the explanatory variable for predicting birth rate.

a) Construct a stem and leaf plot or box plot for birth rate, and describe its distribution.

b) Construct a scatter diagram, and indicate whether a linear model seems appropriate.

c) Fit the model, and interpict the parameter estimates

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

e) Which variable, GNP or women's economic activity, seems to have the stronger asso- ciation with birth rate?

TABLE 9.14 R Square Standard Error Variable WOMEN-EC (Constant) .2973 8.821 B SE B -0.277 36.324 4.700 0.089 Beta -0.545 T Sig T -3.119 0.0048 7.729 0.0001