Question: Has the trend of de creasing difference in age at first

Has the trend of de-creasing difference in age at first marriage seen in Exercise gotten stronger recently? Here are the scatterplot and residual plot for the data from 1975 through 2011, along with a regression for just those years.
Dependent variable is: Men – Women
R- squared = 51.9% s = 0.2143
Variable Coeff
Intercept 42.5662
Year - 0.0203
a) Why is R2 higher for the first model (in Exercise 40)?
b) Is this linear model appropriate for the post- 1975 data? Explain.
c) What does the slope say about marriage ages since 1975?
d) Explain why it’s not safe to interpret the y- intercept.

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