The median sales prices of vacation and investment homes are shown in Table 74 for various years.

Let V be the median sales price (in thousands of dollars) of vacation homes in a certain year, and let I be the median sales price (in thousands of dollars) of investment homes in the same year.
a. Construct a scatterplot that describes the association between V and I. Treat V as the explanatory variable.
b. Describe the four characteristics of the association. Compute and interpret r as part of your analysis.
c. A student concludes that an increase in the median sales price of vacation homes causes an increase in the median sales price of investment homes. What would you tell the student?
d. Describe a possible lurking variable. Explain.

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Table 74 Median Sales Prices of Vacation and Investment Homes Median Sales Price (thousands of dollars) Vacation Home Investment Home Year 2007 2008 2010 2011 2012 2013 2014 195 150 169 150 121 150 169 150 150 108 105 94 100 115 130 125