Question

What is a controlled variable in an experiment?

a
b
A factor that is purposely left the same.
A factor that is purposely changed and being measured.
A factor that will be observed and measured.
A factor that is purposely being changed.
С
d A factor that is purposely being changed

Answer 1

A the factor that is purposely changed

Answer 2

A factor that is purposely left the same.

Step-by-step explanation:

A controlled variable should not be changed throughout an experiment or else it will affect the outcome of each individual trial.