A major pharmaceutical company is conducting clinical trials on a new drug it wants to bring to market. The company surveys 2000 people who have the particular condition that the drug is designed to treat. A portion of the people surveyed receive a high dose of the drug, a portion of the people surveyed receive a medium dose of the drug, and the remaining portion of the people surveyed receive a placebo (sugar pill). The variable in this experiment is:
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the 2000 people surveyed.
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all people with the condition that the drug is intended to treat.
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the dosage of drug administered to each person.
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the placebo (sugar pill).