1. Dan is a manager at Best Buy and wants to talk to customers who have made a purchase recently to provide feedback about their in-store experience. He prints a report of all the sales made in the last day and decides that he will call every 12^th person on the list. What sample design is used?

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2. Tesla is conducting research about its next generation Model S. Because customers of all age groups and lifestyles purchase its automobiles, it begins a process to divide the target population into different groups. The different strata correspond with different demographics and psychographics. While various methods exist to derive samples from the strata — Tesla feels comfortable because they’re assured the representativeness of respondents in the sample. What sample design is used?

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3. Venessa is lecturing in class and wants students to participate. So, she writes everyone’s name on a piece of paper and places it into a hat. She draws names out of a hat to choose five of the sixty students to answer questions. What sample design is used?

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