b. How many dependent and independent variables are there? dependent, independent.Thompson Photo Works purchased several new, highly sophisticated processing machines. The production department needed some guidance with respect to qualifications needed by an operator. ls age a factor? Is the length of service as an operator (in years) important? To evaluate the factors needed to estimate performance on the new processing machines, four variables were selected: X1 = Length of time an employee was in the industry X2 = Mechanical aptitude test score X3 = Prior onthejob rating X4 : Age Performance on the new machine is designated y. Thirty employees were randomly selected and data were collected for each ofthe variables. A few results follow: Performance on New Length of Time in Mechanical Aptitude Prior On-the-Job Machine, Industry, ScoreJ Performance, Age, Name y X1 X2 X3 \"4 Mike Miraglia 111 6 399 129 45 Sue Trythall 115 16 327 121 26 The equation is: g) = 10.8 + 0.7Xl + 0.386X2 + 0.112X3 + 0.00m4