Prescription Drug Sales Retail prescription drug sales in the United States for selected years from 1995 to 2009 are given in the table. Align the data, with x equal to the number of years after 1990.
Year | Sales (billions of $) |
1995 | 72.2 |
2000 | 145.6 |
2001 | 161.3 |
2002 | 182.7 |
2003 | 204.2 |
2004 | 216.7 |
2005 | 226.1 |
2006 | 243.2 |
2007 | 249.2 |
2008 | 253.6 |
2009 | 268.9 |
a. Find a quadratic model for the data.
b. Find a power model for the data.
c. Which model appears more appropriate for predicting the amount of sales after 2009? Why?
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