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The hypothesis states that cigarette smoking increases the risk of lung cancer, with smoking as the independent variable and the risk of lung cancer as the dependent variable.
Hypothesis: If cigarette smoking increases, then the risk of lung cancer also increases.
Independent Variable: Cigarette smoking
Dependent Variable: Risk of lung cancer
Factor to keep constant: Other risk factors for lung cancer, such as exposure to air pollution or genetic predispositions, must be kept constant during the investigation.
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