You've just read a research project titled: "Prolonged cell phone use causes brain tumors."

What is the dependent variable?

A. length of cell phone use

B. number of patients with brain tumors

C. age of patients

D. type of cell phone used

E. medical history of these patients

The correct option is B) number of patients with brain tumors

Explanation:

In a scientific experiment, an independent variable is a variable which is being changed by the scientist or changes naturally. The effect of the independent variable is studied on another variable which is termed as the dependent variable. Hence, the dependent variable can be described as the variable which is under study in a scientific experiment.

In the following scenario, as the effect of prolonged cell phones is being tested on causing brain tumors hence, the number of patients with brain tumors will be the dependent variable.