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In the centuries that followed, people who applied the scientific method in different areas made important advances and discoveries.

Experiments can raise test scores and help a student become more engaged and interested in the material they are learning, especially when used over time.

Experiments can vary from personal and informal natural comparisons (e.g.

Ideally, all variables in an experiment are controlled (accounted for by the control measurements) and none are uncontrolled.

In such an experiment, if all controls work as expected, it is possible to conclude that the experiment works as intended, and that results are due to the effect of the tested variable.

An experiment is a procedure carried out to support, refute, or validate a hypothesis.

Experiments provide insight into cause-and-effect by demonstrating what outcome occurs when a particular factor is manipulated.

A considerable amount of progress on the design and analysis of experiments occurred in the early 20th century, with contributions from statisticians such as Ronald Fisher (1890-1962), Jerzy Neyman (1894-1981), Oscar Kempthorne (1919-2000), Gertrude Mary Cox (1900-1978), and William Gemmell Cochran (1909-1980), among others.

Experiments might be categorized according to a number of dimensions, depending upon professional norms and standards in different fields of study.

Antoine Lavoisier (1743-1794), a French chemist, used experiment to describe new areas, such as combustion and biochemistry and to develop the theory of conservation of mass (matter).

Because of the importance of controlling potentially confounding variables, the use of well-designed laboratory experiments is preferred when possible.

A single study typically does not involve replications of the experiment, but separate studies may be aggregated through systematic review and meta-analysis.

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