Is the study presented above a controlled experiment?
A)Yes, because only the amount of fertilizer was changed, everything else was kept the same.
B)Yes, because many pots were used.
C)No, because the experiment was done only once.
D)No, because several different amounts of fertilizers were used, not just one amount.

Question

Quizplus · Accepted Answer

The study is a controlled experiment because only the amount of fertilizer was changed, while everything else was kept the same.

Is the Study Presented Above a Controlled Experiment