Which of these is a key feature of an experimental study

Question

anonymous · Answer

A. The treatment in the experiment should be simple enough for each individual in the experimental group to understand.B. The treatment in the experiment must vary for each individual in the experimental group.C. The treatment in the experiment must be applied to each of the individuals in the experimental group.D. The treatment in the experiment should be short so that each individual is tested quickly.

theeric · Answer

I would go through and eliminate what you can first.

In an experiment, you want everything to be the same for each group, and change just one thing in each group from the control group.

theeric · Answer

That's so that the difference in the results between any group and the control can be attributed to the changes from the control group.