What does an experimenter want to prevent varation?

An experimenter aims to prevent variation to ensure that the results of the experiment are reliable and can be attributed to the manipulated variables rather than external factors. By controlling or minimizing variation, the experimenter can isolate the effects of the independent variable, making it easier to draw valid conclusions about cause-and-effect relationships. This control enhances the reproducibility of the experiment, allowing other researchers to verify findings. Ultimately, reducing variation increases the overall validity and accuracy of the study's outcomes.