The Oinkster: A Slow Fast Food Restaurant

During one of those hot hot Spring weekends, we decided to go out and have a hamburger to lunch. We picked a restaurant called "The Oinkster." Their motto is that they are a slow fast food restaurant. I think they mean that they serve traditional fast food type dishes, but they prepare it fresh, and so you need to wait for it a little bit.

We had our burgers, and fries, and salad, and we were just about ready to leave when I noticed a little survey on the table. I took one with me, click the Oinkster logo below to see it.

Your job is to look at the survey and answer these questions:

1. What type of sampling method is Oinkster using for this survey? Explain/justify your answer.
2. Describe another sampling method they could have used.
3. What would be the best way to sample Oinkster customers for this survey?