For his final project, Jonathan examined the effects of two factors on how well stains are removed when washing clothes. On each of 16 new white handkerchiefs, he spread a teaspoon of dirty motor oil (obtained from a local garage). He chose 4 Temperature settings (each of which is a combination of wash and rinse: cold-cold, cold-warm, warm-hot, and hot-hot) and 4 Cycle lengths {short, med short, med long, and long). After its washing, each handkerchief was dried in a dryer for 20 minutes and hung up. He rounded up 10 family members to judge the hand-kerchiefs for cleanliness on a scale of 1 to 10 and used the average score as his response. Here are the data:

You may assume, as Jonathan did, that interactions between Temperature and Cycle are negligible. Write a report showing what you found about washing factors and stain removal.