What is the importance of standard variables, controls, number of subjects in experiment, and repetition of experiment?

1. Standard variables- These help ensure that the results of your experiment are not biased.
2. Controls- These ensure that the experiment proves your specific hypothesis. If there are multiple variables then your results can not be narrowed to a specific source.
3. Number of subjects. Having a large test group ensures the validity of the experiment. In a group of 2 one subject would account for more than half the data! If that subject is an outlier than half of your data is irrelevant!
4. Repetition- This shows that your experiments fall under operational
science.
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