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Experiment
A controlled test of a hypothesis in which the researcher manipulates one variable to discover its effect on another.
Independent Variable
In an experiment, the variable that is manipulated or changed by the researcher to observe its effects on the dependent variable.
Manipulated
Altered, controlled, or handled skillfully, often with the implication of unfairness or deceit.
Optimism
A mental attitude characterized by hope and confidence in success and a positive future.
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