The percentages of new-vehicle buyers who use the Internet during the shopping process are shown in Table 19 for various years.

Let p be the percentage of new-vehicle buyers who use the Internet during the shopping process at t years since 2000.

a. Construct a scatterplot.

b. Describe the four characteristics of the association. Compute and interpret r as part of your analysis. Graph the model p = 2.21t + 55.14 on the scatterplot. Does it come close to the data points? What is the slope? What does it mean in this situation? Solve the equation p = 2.21t + 55.14 for t. What is the slope of the model you found in part (e)? What does it mean in this situation?

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Table 19 Percentages of New-Vehicle Buyers Who Use the Internet during the Shopping Process Year Percent 54 2000 2002 2004 2006 2008 2010 2012 64 68 75 79 79