Chapter 7 DOE Montgomery Solutions
Topics: Experiment, Design of experiments, Statistics, Experimental design, Design, Control theory / Pages: 4 (862 words) / Published: Nov 17th, 2013

1. Introduction
The term experiment is defined as the systematic procedure carried out under controlled conditions in order to discover an unknown effect, to test or establish a hypothesis, or to illustrate a known effect. When analyzing a process, experiments are often used to evaluate which process inputs have a significant impact on the process output, and what the target level of those inputs should be to achieve a desired result (output). Experiments can be designed in many different ways to collect this information. Design of Experiments (DOE) is also referred to as Designed Experiments or Experimental Design - all of the terms have the same meaning.
Experimental design can be used at the point of greatest leverage to reduce design costs by speeding up the design process, reducing late engineering design changes, and reducing product material and labor complexity. Designed Experiments are also powerful tools to achieve manufacturing cost savings by minimizing process variation and reducing rework, scrap, and the need for inspection.
This Toolbox module includes a general overview of Experimental Design and links and other resources to assist you in conducting designed experiments. A glossary of terms is also available at any time through the Help function, and we recommend that you read through it to familiarize yourself with any unfamiliar terms.
2. Preparation
If you do not have a general knowledge of statistics, review the Histogram, Statistical Process Control, and Regression and Correlation Analysis modules of the Toolbox prior to working with this module.
You can use the MoreSteam's data analysis software EngineRoom® for Excel to create and analyze many commonly used but powerful experimental designs. Free trials of several other statistical packages can also be downloaded through the Statistical Software module of the Toolbox. In addition, the book DOE Simplified, by Anderson and Whitcomb, comes with a sample of excellent DOE

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