The answer is "random sampling".
In random sampling, every individual from the population has an equivalent shot of being chosen as subject. The whole procedure of examining is done in a solitary advance with each subject chose freely of alternate individuals from the population.
There are numerous strategies to continue with basic random sampling. The most crude and mechanical would be the lottery strategy. A standout among the best things about simple random sampling is the simplicity of collecting the example. It is likewise considered as a reasonable method for choosing an example from a given populace since each part is given equivalent chances of being chosen.
