movie theatre has 12 rows of 20 seats each, for a total of 240 seats. On a busy evening, all of the seats are filled. That evening, the manager of the movie theatre decides to survey people, to find out how many movies they usually see per year.  (a) Describe how this manager could obtain a simple random sample of the people in the theatre.   (b) Recommend a way for the manager obtain a stratified sample of the people in the theatre. What are the strata in this approach?   (c) Recommend a way for the manager to obtain a cluster sample of the people in the theatre. What are the clusters in this approach?

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