A study wanted to see if sunlight would help a cut heal better. They paid college students to volunteer, and the volunteers were random from all over campus. Each volunteer got a cut on their arm. Half the volunteers were instructed to get at least 20 hours of sunlight on the cut for the next week. The other half of the volunteers were instructed to avoid sunlight and get no more than ten minutes of sunlight on the cut. In the end they compared how well the cuts had healed in each group. This scenario is NOT a matched pairs experiment. Let's say we wanted to do a matched pairs experiment with the SAME set of volunteers. How could we change this story to be matched pairs