Question

which variables are kept the same to ensure a fair test

Answer 1

Answer:

A Fair Test tries to keep all other variables constant.

In order to ensure that only the independent variable is affecting the dependent variable (the outcome that will be measured), all the other factors (variables) acting upon the test situation must be kept constant (the controlled variables).

Answer 2

Answer:

A Fair Test tries to keep all other variables constant.

Explanation:

In order to ensure that only the independent variable is affecting the dependent variable (the outcome that will be measured), all the other factors (variables) acting upon the test situation must be kept constant (the controlled variables).

Hope this helps you.