What is the best research method for determining whether one variable has a causal influence on another?

Question

Quizplus · Accepted Answer

An experiment is the best research method for determining whether one variable has a causal influence on another because the experimenter is able to manipulate the independent variable and measure its effect on the dependent variable, while holding all other variables constant. This allows for the establishment of cause-and-effect relationships between variables. Longitudinal studies can provide valuable information about the relationship between variables over time, but they do not establish causality. Correlational studies can identify a relationship between variables, but cannot determine causality. Quasi-experiments have some of the characteristics of experiments, but lack full control over variables, which can limit the ability to establish cause-and-effect relationships.

What Is the Best Research Method for Determining Whether One