Question: 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.

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 features rating and the PCW World Rating for the 10 laptop computers (PC World website, February 5, 2009).

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.

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

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