Final answer:
The dependent variable in the experiment testing how the temperature of a ball affects its bounce height is the bounce height of the ball.
Step-by-step explanation:
In the experiment described where a ball is dropped from the same height each time to test how temperature affects its bounce height, the dependent variable is the height to which the ball bounces after being dropped. This is because the dependent variable is the outcome that the experimenter measures, which in this case is the ball's bounce height. Since the temperature of the ball is what is being manipulated to observe the effect on the bounce height, it can be considered the independent variable. To ensure a fair test and accurate results, variables such as the dropping height, the ball used, and the surface on which the ball is bounced should be kept constant. The control set-up might involve a ball at a reference temperature to compare how variations in temperature affect the bounce height.