Bart wanted to know how often freshman boys at his school drank alcohol, but he couldn't survey every one of them. Bart decided that in order to give all freshman boys an equal chance of being selected to participate in his mini-study, he would visit the dorms at dinnertime and ask them to choose numbers out of a hat. The ones with the number 5 were given a quick three-question survey. Bart is demonstrating .

Simple Random Sample

Explanation:What Is a Simple Random Sample?

A simple random sample is a subset of a statistical population whereby every member stand an equal chance to be chosen. The purpose of simple random sample is to eliminate bias results by ensuring that the sample if full representative of the whole population at large.

"he would visit the dorms at dinnertime and ask them to choose numbers out of a hat." Bart used a hat method in which everyone can be chosen because numbers picked will be random.

okay what's the question?