PCWorld rated four component characteristics for 10 ultraportable laptop computers: features; performance; design; and price. Each characteristic was rated using a 0€“100 point scale. An overall rating, referred to as the PC World Rating, was then developed for each laptop. The data in webfile Laptop are performance rating, features rating, and the PC World Rating for the 10 laptop computers (PCWorld website, February 5, 2009).

a. Determine the estimated regression equation that can be used to predict the PC World Rating using the performance rating as the independent variable.
b. Determine the estimated regression equation that can be used to predict the PC World Rating using both the performance rating and the features rating.
c. Predict the PC World Rating for a laptop computer that has a performance rating of 80 and a features rating of70.

Model Performance Featres PCWold Rating Thinkpad X200 VGN-2598U U6V Elitebook 2530P X360 Thinkpad X300 Ideapad U110 Micro Express JFT2500 Toughbook W7 HP Voodoo Envy133 83 85 83 81 78 78 78 75 6 76 81 73 76 75 68