The advertising and subscription revenues of Pandora® are shown in Table 24 for various years.

Let y be the annual advertising revenue (in millions of dollars) at x years since 2005.
a. Construct by hand a scatterplot that describes the association between x and y.
b. Graph the model = 2(2.192)x by hand on the scatterplot.
c. Describe the four characteristics of the association.
d. What is the y-intercept? What does it mean in this situation? Do you have much faith in your estimate?
e. The annual subscription revenue can be modeled fairly well by the equation = 0.24(2.19)x, where s is the annual subscription revenue (in millions of dollars) at x years since 2005. Compare the bases of the subscription and advertising models. What does your comparison mean in this situation?

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Table 24 Pandora's Annual Advertising and Subscription Revenues Revenue (millions of dollars) Advertising Year 2006 2007 2008 2009 2010 2011 2012 3.25 13.31 18.25 50.15 119.33 239.96 375.22 Subscriptions 0.93 0.99 1.09 5.04 18.43 34.38 5193