You are surveying students to find out their opinion of the quality of food served in the school cafeteria. You decide to poll only those students who buy hot lunch at the school cafeteria on a particular day. Is your sample random? Explain.

No, it is not random because you are asking those who buy the lunch. If they are buying it, they probably like it. Also, it would be better to do it more than one day because if you chose, for instance, pizza day, more people will buy opposed to meatloaf day. Do you get what I mean?