Chapter 14.2, Problem 14E

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

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

1. a. Develop a scatter diagram with the features rating as the independent variable.
2. b. What does the scatter diagram developed in part (a) indicate about the relationship between the two variables?
3. c. Use the least squares method to develop the estimated regression equation.
4. d. Predict the PCW World Rating for a new laptop computer that has a features rating of 70.