DefinitionIn the design of experiments and surveys, experimental samples are selected from the population, and then the sampling frame is used to find the locations of samples in the population, so that they can be graphed and analyzed, if relevant to the study or experiment. Experimental design includes choosing experimental variables, treatment levels, and experimental units as well as designing experimental layouts and procedures to reduce bias and increase efficiency. Sampling is the practice of gathering information or a very small subset (a sample) of individuals or observations from the larger population in order to estimate population parameters and help draw statistical inferences. To obtain the best fruits from certain trees, you have to prune or cut some of the branches of the tree - it is very similar to the principles of experimental design and sampling that are residents of statistics, social sciences, engineering, and business. For example: In a clinical trial of a new drug, the experimental design involves random assignment of patients to treatment and control groups
