Scientists use a variety of methods to test and evaluate their hypotheses. They may use controlled experiments, observational studies, or computer simulations, depending on the nature of their research question. They also use statistical analysis to determine the significance of their results and to evaluate the strength of their conclusions. Scientists may also seek to replicate their findings or conduct meta-analyses of multiple studies to verify their results. Ultimately, the goal is to develop a well-supported theory that explains the phenomenon being studied.