Steve wants to find out if the amount of time he rubs the balloon against his hair has an effect on the amount of hair on his head that is attracted to the balloon. First, he rubs a balloon against his hair for 10 seconds and then holds the balloon fifteen centimeters from his head, looks in a mirror, and records his observations. Then, he rubs the balloon against his head for one minute and then holds the balloon fifteen centimeters from his head, looks in a mirror, and records his observations.