Question

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:

The explanatory variable is what is manipulated (treatment - new medication or placebo). The response variable is what is measured as an outcome (change in blood pressure).

Answer:

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