Manipulating a variable under carefully controlled conditions and observing the changes in a second variable defines

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The experimental approach involves manipulating a variable under carefully controlled conditions and observing the changes in a second variable. This allows researchers to establish cause-and-effect relationships between variables. The other options, testing approach, survey approach, and naturalistic observation, do not involve manipulating a variable in the same way as the experimental approach.

Manipulating a Variable Under Carefully Controlled Conditions and Observing the Changes