The number of subscribers to digital cable television has been growing steadily, as shown by the following table.

a. Find an equation for the least squares line, letting x equal the number of years since 2000.

b. Based on your answer to part a, at approximately what rate is the number of subscribers to digital cable television growing per year?

c. Use your result from part a to predict the number of digital cable subscribers in the year 2012.

d. If this trend continues linearly, in what year will the number of digital cable subscribers first exceed 70 million?

e. Find and interpret the correlation coefficient.

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Year Customers (in millions) 2000 2002 2004 2006 2008 8.5 19.3 25.4 32.6 40.4