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:

Name	Performance on New Machine, Y	Length of Time in Industry, X1	Mechanical Aptitude Score, X2	Prior on-the-Job Performance, X3	Age, X4
Mike Miraglia	120	11	385	117	36
Sue Trythall	118	6	372	119	25

The equation is:

= 11.2 + 0.3X₁ + 0.286X₂ + 0.712X₃ + 0.007X₄

d.	As age increases by one year, how much does estimated performance on the new machine increase? (Round your answer to 3 decimal places.)

e.	Carl Knox applied for a job at Photo Works. He has been in the business for 11 years and scored 270 on the mechanical aptitude test. Carls prior on-the-job performance rating is 80, and he is 25 years old. Estimate Carls performance on the new machine. (Round your answer to 3 decimal places.)