Question

question 19 (1 point)
a medical researcher was conducting an experiment to determine if drug a lowered blood pressure in humans.
what is the independent variable in this experiment?

a drug a
b blood pressure
c the researcher
d humans

Explanation:

To determine the independent variable, we recall that the independent variable is the factor that is manipulated or changed in an experiment to observe its effect on the dependent variable. In this experiment, the researcher is testing if Drug A lowers blood pressure. So, Drug A is the factor being manipulated (given or not given, different doses etc.) to see its effect on blood pressure (the dependent variable). Blood pressure is the outcome being measured (dependent variable), the researcher is not a variable, and humans are the subjects, not the manipulated factor.

Answer:

a. Drug A