Maria and Khuzdar are two students who happen to live in the same province but are located in two different cities, and they do know each other. Maria and her friends are attending an all girls school where all students are receiving a school lunch for free as part of a nutrition program (The objective of this program is to improve students' nutrition). Khuzdar and his friends attend an all-boys school where there are no free lunches provided; however, the school is also part of the nutrition program evaluation experiment. The two cities are very comparable in terms of geography and other characteristics.

a. Using the information provided above, explain whether (or not) students should worry about attrition resulting from the design of their nutrition program (hint:start by defining attrition)Approximate length: 5 lines

b. Assume that you are informed that a mistake happened when running the experiment and the randomization was performed in all-boys school and an all-girls school that are located in the same city. Hint: your answer will heavily depend on the assumption you make. Your assumption should be reasonable. Approximate length: 3 lines

c. One of your friends who does not know about randomized experiments learns about the free school lunch program and suggests to you that it is better to provide some of the students in Khuzdar's school with free lunch using a lottery. Do you agree with this suggestion? Explain. Approximate length: 4 lines