A researcher for the Spaulding athletic equipment company is studying the relationship between the level of education and participation in any sport. She conducts a survey of 40 randomly selected golfers, 40 randomly selected tennis players and 40 randomly selected swimmers. Which sampling type is this?

On Days of presidential elections, the news media organize an exit poll in which specific polling stations are randomly selected and all voters are surveyed as they leave the premises. Which sampling type is this?

An engineering student measures the strength of fingers used to push buttons by testing family members. Which sampling type is this?

In Internal Revenue Service researcher investigates cheating on income tax reports by surveying all waiters and waitresses at 20 randomly selected restaurants. Which sampling type is this?

The author of a study surveyed all of his students to obtain sample data consisting of the number of credit cards students possess. Which sampling type is this?

In a Gallup poll of 1059 adults, the interview subjects were selected by using a computer to randomly generate telephone numbers that were then called. Which sampling type is this?

Motivated by a student who died from binge drinking, the College of Newport conducts a study of student drinking by randomly selecting 10 different classes and interviewing all of the students in each of those classes. Which sampling type is this?

A market researcher has partitioned all California residents into categories of unemployed, employed full time, and employed part time. She is surveying 50 people from each category. Which sampling type is this?

Fund-raisers for the local college test a new telemarketing campaign by obtaining a list of all alumni and selecting every 100th name on that list. Which sampling type is this?