Question

Which of the following could negatively affect the reliability of an experiment? A.testing only one variable at a time

B.having variables that are difficult or even impossible to control
C. keeping the control monitored to make sure it remains unchanged

Answer 1

B) Having variables that are difficult or even impossible to control.

Answer 2

The answer to this is B. When conducting an experiment, you should only manipulate one variable at a time and all other variables should be kept as similar as possible in order to ensure that the results are caused by one thing and not another.