1.Name the sampling method (convenience, systematic, clustering, stratified, or random) used in each of the following situations.Explain how you knew which one was which.Each sampling method appears exactly once.

a.A researcher in the airport is handing out questionnaires to travelers asking them to evaluate the airport's service. They do not ask travelers who are hurrying through the airport with their hands full of luggage, but instead asks all travelers who are sitting near gates and not taking naps while they wait.

b.A teacher wants to know if their students are doing homework, so they randomly selects rows two and five and then calls on all students in row two and all students in row five to present the solutions to homework problems to the class.

c.The librarian at a public library wants to determine what proportion of the library users are children. The librarian has a tally sheet on which they mark whether books are checked out by an adult or a child. They record this data for every fourth patron who checks out books.

d.A political party wants to know the reaction of voters to a debate between the candidates. The day after the debate, the party's polling staff calls 1,200 randomly selected phone numbers. They call until the registered voter answers.That registered voter is asked whom they intend to vote for and whether the debate changed their opinion of the candidates.

e.A researcher randomly selects 10 people from each congressional district and surveys their opinions about abortion.