In studies conducted to establish cause-and-effect relationships,the researcher tries to manipulate certain variables so as to study the effects of such manipulation on the dependent variable of interest.

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Manipulating certain variables is a key component of experimental research, which is used to establish cause-and-effect relationships between variables. By manipulating the independent variable and observing its effect on the dependent variable, researchers can determine whether changes in one variable directly cause changes in another.

In Studies Conducted to Establish Cause-And-Effect Relationships,the Researcher Tries to Manipulate