Digital music sales in the United States are shown in Table 31 for various years.

Let s be the annual U.S. digital music sales (in billions of dollars) at t years since 2005.
a. Use technology to construct a scatterplot.
b. Describe the four characteristics of the association. Compute and interpret r as part of your analysis.
c. Use technology to graph the model s = 0.4t + 1.3 on the scatterplot. Does the line come close to the data points?
d. What is the s-intercept? What does it mean in this situation?
e. Estimate the sales in 2012.

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Table 31 Digital Music Sales in the United States Sales (billions of dollars) Year 2005 2007 2009 2011 2013 1.1 2.3 3,0 3.6 4.4