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A marketing researcher for a phone company surveys 150 people and finds that the proportion...

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Finance

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A marketing researcher for a phone company surveys 150 people and finds that the proportion of clients who are likely to switch providers when their contract expires is 0.13. a) What is the standard deviation of the sampling distribution of the proportion? b) if she wants to reduce the standard deviation by half how farge of a sample would she nood? The standard deviation of the sampling distribution of the proportion is 0.02 (Round to three decimal places as needed.) b) She will need a sample of ). (Type a whole number)

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