PC Worldprovided ratings for the top five small-office laser printers and five corporate laser printers (PC World,February 2003). The highest rated small-office laser printer was the Minolta-QMS Page Pro 1250W, with an overall rating of 91. The highest rated corporate laser printer, the Xerox Phase 4400/N, had an overall rating of 83. The following data show the speed for plain text printing in pages per minute (ppm) and the price for each printer.
Name
Type
Speed (ppm)
Price ($)
Minolta-QMS PagePro 1250W
Small Office
12
199
Brother HL-1850
10
499
Lexmark E320
12.2
299
Minolta-QMS PagePro 1250E
10.3
HP Laserjet 1200
11.7
399
Xerox Phaser 4400/N
Corporate
17.8
1850
Brother HL-2460N
16.1
1000
IBM Info print 1120n
11.8
1387
Lexmark W812
19.8
2089
Oki Data B8300n
28.2
2200
a. Develop the estimated regression equation with speed as the independent variable.
b. Computer2. What percentage of the variation in price can be explained by the printing speed?
c. What is the sample correlation coefficient between speed and price? Does it reflect a strong or weak relationship between printing speed and cost?
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