How do you use control variable in a sentence?

Answer 1

• Most of scientific experiments use controlled variable to evaluate the result.
• controlled variable allows us many benefits over traditional variables.
  
• Double blind studies often use controlled variables & pseudo Drugs.

Answer 2

u go to McDonald's and buy a big mac and eliminate all of the other variable and decide what u want and decide that's your controlled variable

Answer 3

Here are some sentences.

The controlled variable in that experiment is the mouse.

You need a controlled variable if you're going to test that theory.