Here's why:
* Control group: This group serves as a baseline for comparison. They don't receive the treatment, intervention, or change that the experimental group does. This allows researchers to see if any changes observed in the experimental group are actually due to the treatment, or if they would have happened naturally.
* Experimental group: This group receives the treatment, intervention, or change being tested.
Think of it like this:
* You want to test if a new fertilizer makes plants grow taller.
* You have two groups of plants:
* Control group: Gets regular water and no fertilizer.
* Experimental group: Gets regular water and the new fertilizer.
* By comparing the growth of the two groups, you can see if the fertilizer actually had an effect.
