Look again at the graph of the age at first marriage for women in Exercise 42. Here is a regression model for the data on women, along with a residuals plot:

a) Based on this model, what would you predict the marriage age will be for women in 2025?
b) How much faith do you place in this prediction? Explain.
c) Would you use this model to make a prediction about your grandchildren, say, 50 years from now?

Now, let’s restrict our model to the years 1975–2015. Here are the regression and residual plot:

d) Based on this model, what would you predict the marriage age will be for women in 2025?
e) How much faith do you place in this prediction?
f) Would you use this model to make a prediction about your grandchildren, say, 50 years from now?

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Residuals 4 2 0 Response variable is: R-squared = 61.1% s = 1.474 Variable Intercept Year Women Coefficient -112.543 0.068479 + + + 1900 1920 1940 1960 1980 2000 Year