Question

independent practice
in a study to determine the effectiveness of a new medication to treat high blood pressure,
participants are either given the new medication, or a sugar pill (called a placebo). after
three months, the change in blood pressure for each participant was determined.
identify the explanatory variable and the response variable of the experiment.
explanatory variable: the treatment (new medication or placebo);
response variable: the change in blood pressure.
explanatory variable: the change in blood pressure; response variable:
the treatment (new medication or placebo).
explanatory variable: the new medication; response variable: change in
blood pressure
explanatory variable: change in blood pressure; response variable: the
new medication.

Explanation:

An explanatory variable is the one that is manipulated or changed in an experiment to observe its effect on the response variable. Here, the treatment (new medication or placebo) is what the researchers are controlling (manipulating). The response variable is what is being measured or observed as a result of the change in the explanatory variable. In this case, the change in blood pressure is being measured to see the effect of the treatment.

Answer:

Explanatory Variable: The treatment (new medication or placebo); Response Variable: The change in blood pressure.