A social psychologist measures aggressive responses made by people exposed to violent and nonviolent movies. All of the subjects are tested in rooms having identical room temperature. In this experiment, the room temperature is a(n) variable.
a. correlated
b. independent
c. dependent
d. extraneous

Explanation:

Extraneous variables are variables which occur unintentionally while doing a research. When a researcher tries to find if an independent variable has an effect on a dependent variable, they may be chances that unexpected variable might occur which may affect the results of the research.

Here, the researcher who measured aggressive responses by people when exposed to violent and non-violent movies did not take into account the room temperature.

The room temperature may act as an extraneous variable which may have an effect on the result of his experiment.