Question: Has the trend of decreasing difference in age at first marriage seen in Exercise 42 gotten stronger recently? The scatterplot and residual plot for the

Has the trend of decreasing difference in age at first marriage seen in Exercise 42 gotten stronger recently? The scatterplot and residual plot for the data from 1980 through 2015, along with a regression for just those years, are below.

Men's Age-Women's Age Residuals 2.50 2.25 2.00 1.75 0.20 0.05 -0.10 -0.25

0000 + + + 1980 1985 1990 1995 2000 2005 2010 2015

a) Is this linear model appropriate for the post-1980 data?
b) What does the slope say about marriage ages?
c) Explain why it’s not reasonable to interpret the y-intercept.

Men's Age-Women's Age Residuals 2.50 2.25 2.00 1.75 0.20 0.05 -0.10 -0.25 0000 + + + 1980 1985 1990 1995 2000 2005 2010 2015 Year + + + 1985 1990 1995 2000 2005 2010 2015 Year

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