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the methodological studying of the natural world through experimentation and verification of facts.
observations made by the 5 senses. (seeing, feeling, touching, smelling, tasting.)
observations made by using measuring instruments. (number-based observations)
to repeat a research study, usually with different participants and in different situations, to confirm the results of the original study
The number of subjects used in an experiment or study. Generally, the larger the better.
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