Which term describes the variable that is typically kept identical across all experimental groups?

Which term describes the variable that is typically kept identical across all experimental groups?

• A. Independent Variable
• B. Dependent Variable
• C. Control Variable
• D. Constant

Answer: (C)

Think about making a fair test so you can see the real effect of what you’re changing. When you run multiple groups, you keep everything else the same so differences in the results point to the factor you’re testing. The variables you keep identical across all groups are called control variables. They’re the elements you hold steady (like temperature, light, or time) to prevent other factors from influencing the outcome. The thing you actively change is the independent variable, and what you measure is the dependent variable. While a constant is something that doesn’t change, the role described here—keeping factors the same across groups—is best captured by the term control variable.

Think about making a fair test so you can see the real effect of what you’re changing. When you run multiple groups, you keep everything else the same so differences in the results point to the factor you’re testing. The variables you keep identical across all groups are called control variables. They’re the elements you hold steady (like temperature, light, or time) to prevent other factors from influencing the outcome. The thing you actively change is the independent variable, and what you measure is the dependent variable. While a constant is something that doesn’t change, the role described here—keeping factors the same across groups—is best captured by the term control variable.