The percentages of households that consist of married couples with children are shown in Table 21 for various years.

Let f (t) be the percentage of households that consist of married couples with children at t years since 1980.
a. Construct a scatterplot.
b. Describe the four characteristics of the association. Compute and interpret r as part of your analysis.
c. Find an equation of f.
d. Find f (28). What does it mean in this situation?
e. Find t when f (t) = 28.What does it mean in this situation?

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Table 21 Percentages of Households That Consist of Married Couples with Children Year Percent 1980 1990 1995 2000 2005 2010 2012 30.9 26.3 25.5 24.1 22.9 20.9 19.6