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.

Explain Bot · Answer

To determine the number of levels in this experiment's independent variable, we need to look at the different conditions that the participants were exposed to. In this case, the independent variable is the dosage of the drug administered to the participants. Based on the information given, the researcher administered three different dosages: a placebo (0mg), 10mg, and 20mg. Therefore, the independent variable in this experiment has three levels: placebo, 10mg, and 20mg.