Problem

iPhone Sales The following table shows Apple iPhone sales from the 2nd qua...

iPhone Sales The following table shows Apple iPhone sales from the 2nd quarter in 2007 through the second quarter in 2008 (t = 2 represents the second quarter of 2007):

a. Find a quadratic regression model for these data. (Round coefficients to the nearest whole number.) Graph the model together with the data.

b. What does the model predict for iPhone sales in the third quarter of 2008 (t = 7) to the nearest 1,000 units? Comment on the answer, and ascertain the actual third quarter sales in 2008 ( Apple’s fiscal fourth quarter).

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Solutions For Problems in Chapter 2.1

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