An experiment was created to test if the heat of the sun has any effect on physical performance. The sun is known to tire people out for several hours after being in the sun. A group of 20 people are to run three miles in the direct strong sun and also in indirect sun. Some of the people begin at 9:00 a.m. (indirect sun) and then again at 1:00 p.m. (full sun). Others begin at 2:00 p.m. (full sun) and then again at 6:00 p.m. (indirect sun). Which group of people is more likely to experience an order effect? Those that begin at 9:00, those that begin at 2:00, or are they equal? Please explain. (You will need to explain what the order effect is, if it is possible to exist.)