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Productivity Dependent and Independent Variables

I need help in directing me to the right path in finding the following statement:

Discuss the following identifying independent and dependent variables in your study

1) An observational study to determine the productivity of an assembly line.

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The first thing you would to do is define what an independent and a dependent variable is. This will help put the assignment in perspective.

The general definition of a variable is "A measurable quantity that is subject to change." pg 16 of Quantitative Analysis for Management Barry Render, Ralph M. Stair Jr. Michael E. Hanna publisher Pearson Education, Inc. Upper Saddle River, New Jersey, 07458. 2003

Generally speaking statistical methods are used to evaluate productivity. If you have a text book for Statistical Analysis, this may shed more light on the productivity and the mathematical calculations used for determining productivity.
I have ...

Solution Summary

This assignment requested that the student identify and explain indepent and dependent variables for productivity. The student was given an explanation and provided with websites that gave more explanation and examples from which the student could draw from.