Experimental Design Vs Experimental Study

Design of experiments (DOE) or experimental design is the design of any information-gathering training where deviation is present, whether under the full control of the researcher or not. However, in statistics, these terms are usually used for controlled experiments. Proper designed experimentation is often use to evaluate physical objects, chemical formulations, structure, components and materials. Other types of study, and their design, are discussed in the articles on computer experiments, opinion polls and statistical surveys (which are types of observational study), natural experiments and quasi-experiments (for example, quasi-experimental design).

In the design of experiments, the researcher is regularly interested in the effect of some process or interference on some objects (the " trial units"), which may be people, part of people, groups of people, plants, birds, etc. Design of experiments is thus a authority that has very wide application across all the natural and social sciences and engineering.

3.2 Principles of experimental design
A methodology for designing experiments was proposed by Ronald A. Fisher, in his innovative books: “The Arrangement of field experience” (1926) and “The Design of experiments”(1935). Much of his pioneering work dealt

Under this assumption, the effect of each factor can be linear, quadratic or of higher order, but the model assumes that there exists no cross product effects (interactions) among the individual factors. That means the effect of independent variable 1 on performance parameter does not depend on the different level settings of any other independent variables and vice versa. If at anytime, this assumption is violated, then the additivity of the main effects does not hold, and the variables