A researcher has conducted an experiment in which she has given participants a placebo, 10mg, and 20mg of a drug. She then measured their anxiety, blood pressure, and heart rate in response to the drug. How many levels does this experiment’s independent variable have?

Question

A researcher has conducted an experiment in which she has given participants a placebo, 10mg, and 20mg of a drug. She then measured their anxiety, blood pressure, and heart rate in response to the drug.  How many levels does this experiment’s independent variable have?

John · Answer

The indep. variable is the drug and it has 3 levels - placebo, 10 mg and 20 mg. the response to the drug is the dependent variable because the values are dependent on the amount of drug given.