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Suppose the student council at a large high school wants to measure student approval of school leadership using a simple random sample of size $n = 100$.
What would be the best way to select these students?
Go to the cafeteria during lunch and select $5$ students at each table until the sample size is $100$.
Since $100$ students are currently enrolled in AP Statistics in this school, sample those $100$ students.
Obtain a list of all students from the registrar and assign a number to each, then use a random number generator to select $100$ students.
Since government is a required daily course, survey all the students in the government classes during one school day until $n = 100$.
Have each of the $10$ members of the student council ask $10$ of their friends, telling the members try to ask different types of people.