The ratios of the median wealth of upper-income house- holds to the median wealth of middle-income households are shown in Table 62 for various years.

Let y be the ratio of the median wealth of upper-income households to the median wealth of middle-income house- holds at x years since 1990.
a. Construct a scatterplot.
b. Describe the four characteristics of the association. Compute and interpret r as part of your analysis.
c. Use two points to find an equation of a model.
d. Use the model to estimate when the median wealth of upper-income households was 6 times the median wealth of middle-income households.
e. In 2012, the median wealth of middle-income households was $96,500. Use the model to help you estimate the median wealth of upper-income households in 2012.

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Table 62 Ratios of the Median Wealth of Upper-Income Households to the Median Wealth of Middle-Income Households Year Ratio 1995 1998 2001 2004 2007 2010 2013 3.6 4.1 4.4 5.0 4.5 6.2 6.6