Retail Price Data for N = 60 Hard Disk Drives $y =$

question 98

Essay

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)
$x _ { 1 } =$ Microprocessor SPEED (measured in megahertz)
(Values in sample range from 10 to 40 )
$x _ { 2 } =$ 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:

$\quad$ $\quad$ $\quad$ $\quad$ $\quad$$\quad$ $\quad$ $\quad$ $\quad$ $\quad$$\text { Parameter Estimates }$

$\quad$ $\quad$ $\quad$$\text { PARAMETER STANDARD\quad\quad\quad\quad T FOR 0: }$
$\text { VARIABLE DF ESTIMATE } \quad \text { ERROR PARAMETER }=0 \mathrm{PROB}>|\mathrm{T}|$
$\begin{array}{lrllll}\text { INTERCEPT } & 1 & -373.526392 & 1258.1243396 & -0.297 & 0.7676 \\\text { SPEED } & 1 & 104.838940 & 22.36298195 & 4.688 & 0.0001 \\\text { CHIP } & 1 & 3.571850 & 3.89422935 & 0.917 & 0.3629\end{array}$
Identify and interpret the estimate of $\beta _ { 2 }$ .

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Definitions:

Photoreceptors

Specialized cells located in the retina of the eye that convert light into electrical signals, allowing vision.

Vitreous Chamber

The clear, gel-filled space located between the lens and the retina in the eyeball, helping to maintain eye shape and optical properties.

Semicircular Canals

Structures in the inner ear that are key to maintaining balance and sensing rotations of the head.

Sensory Receptors

Sensory receptors are specialized cells located throughout the body that detect changes in the environment and send information to the brain, initiating sensation and perception.