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Question: Binomial setting? A binomial distribution will be approximately correct as a model for one of these two settings and not for the other. Explain why by briefly discussing both settings.

(a) When an opinion poll calls residential telephone numbers at random, only 20% of the calls reach a person. You watch the random digit dialing machine make 15 calls. X is the number that reach a person.

(b) When an opinion poll calls residential telephone numbers at random, only 20% of the calls reach a live person. You watch the random digit dialing machine make calls. Y is the number of calls needed to reach a live person.

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