Which of the following accurately describes the benefit of comparison in the experiment shown in the design web?

Comparison lets you evaluate whether the fertilizer caused a difference in plant growth. Compare the plants receiving fertilizer (the treatment group) with plants that do not receive it (the control group); comparing only treated plants would not show what their growth would have been without fertilizer. The correct choice is that the two groups can be compared to see whether fertilizer had a significant effect.

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