Thompson Photo Works purchased several new, highly sophisticated processing machines

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Thompson Photo Works purchased several new, highly sophisticated processing machines. The production department needed some guidance with respect to qualifications needed by an operator. Is age a factor? Is the length of service as an operator (in years) important? In order to explore further the factors needed to estimate performance on the new processing machines, four variables were listed:

x₁ = Length of time an employee was in the industry

x₂ = Mechanical aptitude test score

x₃ = Prior on-the-job rating

x₄ = Age

Performance on the new machine is designated y.

Thirty employees were selected at random. Data were collected for each, and their performances on the new machines were recorded. A few results are:

	Performance on New Machine,		Length of Time in Industry,		Mechanical Aptitude Score,		Prior On-the-Job Performance,		Age,
Name	y		x1		x2		x3		x4
Mike Miraglia	114		4		301		124		38
Sue Trythall	115		10		335		128		30

The equation is:

yˆ y?^?  = 11.0 + 0.6x₁ + 0.286x₂ + 0.512x₃ + 0.009x₄

1. What is this equation called?

multiple choice 1

• Multiple regression equation

• Multiple standard error of estimate

• Coefficient of determination

2. How many dependent and independent variables are there?