The procedure of science must be executed in a way that does not influence the results. Methods such as double blind, randomization, variable matching, and analysis of variance, are aimed at eliminating bias and are particularly important when dealing with phenomena that directly impinge upon human beings. The third standard of good science requires that the result be repeatable. For a scientific conclusion to be acceptable, other scientists must be able to repeat it in other locations at other times employing the same methods. The fourth standard of good science requires that the results be published in a scientific journal or other publication that is peer reviewed.
Scientists have a general consensus about what constitutes good experimental design.
It is that consensus about good experimental design that inherently tests a null hypothesis. The single most important aspect of good experimental design that tests a null hypothesis is the requirement that the experimenter's hypothesis be capable of being disproved by the experiment. To allow a hypothesis of causation to be disproved, the scientist must allow an equal opportunity for the truly opposite, or null, hypothesis to be proven. Rejecting Null Hypotheses. If I put my hand over a burning candle, I will not get burned.