Experiments are carried out to test a hypothesis by changing one variable at a time and including an unchanged variable termed a(n)________.
A)experimental variable
B)altered variable
C)control
D)stable variable

Question

Quizplus · Accepted Answer

The control is the unchanged variable included in an experiment to serve as a basis for comparison with the experimental variable being tested. It allows for the determination of whether the changes observed in the experimental variable are due solely to the manipulation of that variable or if they are the result of other factors. Therefore, the best choice is C. A is incorrect because it refers to the variable being changed, not the control. B and D are not commonly used terms in experimental design.

Experiments Are Carried Out to Test a Hypothesis by Changing