• PCWorld rated four component characteristics for 10 ultraportable laptop computers: fea- tures, 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 Thinkpad X200 VGN-Z598U U6V Elitebook 2530P X360 Thinkpad X300 Ideapad U110 Micro Express JFT2500 Toughbook W7 HP Voodoo Envy133 Features PCW World Rating Rating 87 83 85 82 80 81 75 78 80 78 76 78 81 77 73 75 79 73 68 72 a. Develop a scatter diagram with the features rating 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. Predict the PCW World Rating for a new laptop computer that has a features rating of 70.