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A marketing researcher for a phone company surveys 100 100 people and finds that the proportion of clients who are likely to switch providers when

A marketing researcher for a phone company surveys 100

100 people and finds that the proportion of clients who are likely to switch providers when their contract expires is 0.21

a) What is the standard deviation of the sampling distribution of theproportion?

b) If she wants to reduce the standard deviation byhalf, how large of a sample would sheneed?

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