The file P02_26.xlsx lists sales (in millions of dollars) of Dell Computer during the period 1987–1997 (where year 1 corresponds to 1987).

a. Fit a power and an exponential trend curve to these data. Which fits the data better?

b. Use your part a answer to predict 1999 sales for Dell.

c. Use your part a answer to describe how the sales of Dell have grown from year to year.

d. Search the Web for more recent Dell sales data. Then repeat the preceding parts using all of the data.