Chapter 15.2, Problem 7E

PC World 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 PCW World Rating, was then developed for each laptop. The following table shows the performance rating, features rating, and the PCW World Rating for the 10 laptop computers (PC World website, February 5, 2009).

Model	Performance	Features	PCW Rating
Thinkpad X200	77	87	83
VGN-Z598U	97	85	82
U6V	83	80	81
Elitebook 2530P	77	75	78
X360	64	80	78
Thinkpad X300	56	76	78
Ideapad U110	55	81	77
Micro Express JFT2500	76	73	75
Toughbook W7	46	79	73
HP Voodoo Envy133	54	68	72

1. a. Determine the estimated regression equation that can be used to predict the PCW World Rating using the performance rating as the independent variable.
2. b. Determine the estimated regression equation that can be used to predict the PCW World Rating using both the performance rating and the features rating.
3. c. Predict the PCW World Rating for a laptop computer that has a performance rating of 80 and a features rating of 70.