What makes a test fair?

Answer 1

to ensure a fair test, the scientist carrying out the experiment must be fair skinned with fair hair. otherwise the test will not be fair, obviously. Another way to do a fair test is to talk around a fair, try out the rides and evaluate.

Answer 2

for example, if your testing how long it takes for water to heat up under the yellow bunsen burner flame against the blue, if the water had a different weight and mass to the other beaker, it wouldn't be a fair test.