Overview
According to the previous homework and instructor's comment, answer the three questions. According to the previous homework and instructor's comment, answer these three questions. You can find most answer in the homework, but you need to revise it according to the comments. Two pages in total for these three questions. Note: We are changing the frequency of the the experiment into once a week, not once in two weeks, randomize two cafeteria, if the cafeteria 1 is the control this week, and then 2 is the treatment this week.