A marketing researcher for a phone company conducteda survey of 500 people and then constructed a confidenceinterval for the proportion of customers who are likelyto switch providers when their contract expires. Afterseeing this interval, the company CEO insisted that theresearcher repeat the survey and provide an interval witha margin of error half as large. What sample size shouldthe researcher use for the new survey?A) 250 B) 354 C) 708D) 1000 E) 2000

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