3.39 Smartphones The table below shows the EX0339 prices of nine U.S. Verizon smartphones along with their overall score (on a scale of 0-100) in a con- sumer rating survey presented by Consumer Reports.

a. Plot the nine data points using a scatterplot. Describe the form, direction, and strength of the relationship between price and overall score.

b. Calculater, the correlation coefficient between price and overall score.

c. Find the regression line for predicting the overall score of a smartphone based on its price.

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Brand and Model Price(S) Overall Score Motorola Droid X 200 75 Motorola Droid 150 73 HTC Droid 200 73 LG Ally 50 72 Samsung Omnia II 50 71 HTC Imagio 100 70 Motorola Devour 80 70 Blackberry Storm2 9550 150 70 Palm Pre Plus 50 66 Source: "Cell Phones and Services: Smart Phone Ratings" 2010, Consumers Union of U.S., Inc. Yonkers, NY 10703-1057, a nonprofit organization. Reprinted with permission from the August 2010, of Consumer Reports for educational purposes only. www.ConsumerReports.org.