The video-sharing site YouTube attracted 19.6 million visitors in June 2006, an almost 300% increase from January of that same year. Despite YouTube€™s phenomenal growth, some analysts have questioned whether the site can transition from a free service to one that can make money. The growth trend for YouTube from August 2005 to June 2006 is given the following table.

Linear and quadratic fitted plots for these data follow.

a. Based upon the summary statistics in the line plots, which of the two models better fits the data?

b. Write the equation for the quadratic model.

c. Use the following printout to determine if the quadratic term contributes significant information to the prediction of y, in the presence of the linear term.

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Total Unique Visitors (000) Time Coded Time 8/2005 9/2005 72 2 100 10/2005 11/2005 12/2005 3 750 990 1600 2800 1/2006 2/2006 3/2006 4/2006 5/2006 6 4100 5700 6600 10 12,600 12,800 6/2006 11 Fitted Line Plot y = -3432 + 1301 x 15,000 1840 38 R-S R-Syalj) 858% 842% 10,000 5000 6. 10 12 2.