A design experiment is a test or series of tests in which purposeful changes are made to the input variables of a process or a system so that we may observe and identify the reasons for changes in the output response.
The system or process can be represented by the model shown in figure below.
To use statistical approach in designing and analyzing an experiment, it is necessary that everyone involved in the experiment have a clear idea in advance of exactly what is to be studied, how the data are to be collected and at least a qualitative understanding of how these data are to be analyzed. An outline of the recommended procedure is :
1. Recognition of and statement of a problem
2. Choice of factors and levels
3. Selection of the response variable
4. Choice the experimental design
5. Data analyze
6. Conclusions and recommendations
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