Question

to study the dependant variable, a scientist must __________. a. manipulate the independent variable b. have more than one control group c. manipulate the dependent variable d. have more than one experimental group please select the best answer from the choices provided

Explanation:

In an experiment, the independent variable is manipulated to observe its effect on the dependent variable. A control group is kept constant for comparison, and the number of control or experimental groups isn't a requirement for studying the dependent - variable. Manipulating the dependent variable directly defeats the purpose of the experiment.

Answer:

A. manipulate the independent variable