Students analyze different experiments to determine independent variables, dependent variables and control groups.

Make alterations in the variables of the original ZOOM Daredevil Ball Jump activity by heating or cooling the balls in the experiment. Predict how the balls' bounces will be affected by hot and cold, test the predictions and record the...

This site from Glencoe Publishing not only explains hypothesis but also tells how to design an experiment to test your hypothesis. Includes the difficult task of "Separating and controlling variables."