Answer:
The control group in this scenario would be a ball with the same properties (e.g., size, material, inflation pressure) as the experimental group, but without adding more air to it.
Step-by-step explanation:
The control group in this scenario would be a ball with the same properties (e.g., size, material, inflation pressure) as the experimental group, but without adding more air to it. The purpose of the control group is to serve as a baseline for comparison with the experimental group, which is the one in which more air is added to the ball. By comparing the bounce height of the experimental group with that of the control group, we can determine whether the increase in bounce height is due to the change in air pressure or some other factor.