iPod Sales The following table shows Apple iPod sales from the second quar...

iPod Sales The following table shows Apple iPod sales from the second quarter of 2009 through the second quarter of 2010.

a. Find a quadratic regression model for these data. (Round coefficients to two significant digits.) Graph the model together with the data.

b. What does the model predict for iPod sales in the third quarter of 2010 (t = 7), to the nearest million? Comment on the answer.