Author Question: Retail price data for n = 60 hard disk drives were recently reported in a computer magazine. Three ... (Read 128 times)

arivle123 · **on:** Feb 14, 2020

Retail price data for n = 60 hard disk drives were recently reported in a computer magazine. Three variables were recorded for each hard disk drive:

y = Retail PRICE (measured in dollars)
x₁ = Microprocessor SPEED (measured in megahertz)
(Values in sample range from 10 to 40)
x₂ = CHIP size (measured in computer processing units)
(Values in sample range from 286 to 486)

A first-order regression model was fit to the data. Part of the printout follows:

Parameter Estimates

Identify and interpret the estimate for the SPEED β-coefficient,

1.
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1 = 3.57; For every $1 increase in PRICE, we estimate SPPED to increase by about 4 megahertz, holding CHIP fixed.
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1 = 3.57; For every 1-megahertz increase in SPEED, we estimate PRICE to increase $3,57, holding CHIP fixed.
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1 = 105; For every $1 increase in PRICE, we estimate SPEED to increase 105 megahertz, holding CHIP fixed.
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1 = 105; For every 1-megahertz increase in SPEED, we estimate PRICE (y) to increase $105, holding CHIP fixed.

choc0chan · **Reply #1 on:** Feb 14, 2020

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