Suppose you want to know the ages of moviegoers who attend the latest X-Men movie. What kind

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Suppose you want to know the ages of moviegoers who attend the latest X-Men movie. What kind of sample is it if you

(a) Survey the first 20 persons to emerge from the theater,

(b) Survey every 10th person to emerge from the theater,

(c) Survey everyone who looks under age 12?

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