Practice Quiz

Registered Dietitian

Category - Nutrition Science

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Identify the independent and dependent variables in the following statement: “Use of statin drugs reduces the risk of heart disease in men between the ages of 45 and 65.”
  1. Independent variable: heart disease; dependent variable: statin drugs
  2. Independent variable: statin drugs; dependent variable: heart disease
  3. Independent variable: statin drugs; dependent variable: 45-65-year-old men
  4. Independent variable: 45-65-year-old men; dependent variable: statin drugs
Explanation
Answer: B - In the sentence, “use of statin drugs reduces the risk of heart disease in men between the ages of 45 and 65,” the independent variable is statin drugs, and the dependent variable is heart disease. The independent variable always directly affects the dependent variable. Heart disease cannot be the independent variable because it cannot affect statin drugs. In addition, statin drugs cannot directly affect men between the ages of 45 and 65, and men aged 45-65 years cannot affect statin drugs.
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