To help consumers in purchasing a laptop computer, Consumer Reports calculates an overall test score for each computer tested based upon rating factors such as ergonomics, portability, performance, display, and battery life. Higher overall scores indicate better test results. The following data show the average retail price and the overall score for ten 13-inch models (Consumer Reports website, October 25, 2012).

Brand & Model	Price ($)	Overall Score
Samsung Ultrabook NP900X3C-A01US	1250	83
Apple MacBook Air MC965LL/A	1300	83
Apple MacBook Air MD231LL/A	1200	82
HP ENVY 13-2050nr Spectre XT	950	79
Sony VAIO SVS13112FXB	800	77
Acer Aspire S5-391-9880 Ultrabook	1200	74
Apple MacBook Pro MD101LL/A	1200	74
Apple MacBook Pro MD313LL/A	1000	73
Dell Inspiron I13Z-6591SLV	700	67
Samsung NP535U3C-A01US	600	63

a. Develop a scatter diagram with price as the independent variable.

b. What does the scatter diagram developed in part (a) indicate about the relationship between the two variables?

c. Use the least squares method to develop the estimated regression equation.

d. Provide an interpretation of the slope of the estimated regression equation.

e. Another laptop that Consumer Reports tested is the Acer Aspire S3-951-6646 Ultrabook; the price for this laptop was $700. Predict the overall score for this laptop using the estimated regression equation developed in part (c).