Question

Which of the following is true about the variables in an experiment? a. They need to test for only one variable, and that needs to be the only difference between the groups. b. They should test for several variables and then use the one that best fits their hypothesis. c. It is easier to study two groups or variables at a time. d. The experimental variable is performed on the control group only.

Answer 1

In an experiment, it is important to test for only one variable and ensure that it is the only difference between the groups.

Step-by-step explanation:

The correct answer is option A: They need to test for only one variable, and that needs to be the only difference between the groups. In an experiment, variables are the factors that can change and affect the outcome. To accurately determine the effect of a specific variable, it is important to isolate it and keep all other factors constant. This allows for a clear comparison between the control group and the experimental group.

Learn more about Variables in an experiment