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Experimental investigations involve designing a fair test similar to a comparative investigation, but a control group is also identified. The variables are measured in an effort to gather evidence to support or not support a causal relationship.
Experimental investigations involve a process in which a "fair test" is designed and variables are actively manipulated, controlled, and measured in an effort to gather evidence to support or refute a causal relationship. Experimental investigations have a control group which does not receive any treatment.
Comparative investigations involve collecting data on different organisms/objects/features, or collecting data under different conditions (e.g., times of year, temperatures, locations) to make a comparison.
With this information, we can conclude that Experimental investigations involve designing a fair test similar to a comparative investigation, but a control group is also identified.
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