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A marketing researcher for a phone company surveys 180 people and finds that the proportion of customers who are likely to sw
b) If she wants to reduce the standard deviation by half, how large a sample would she need? ne (Type a whole number.)
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Solution- 0.88 10.12 Given na 180 P= 129% =0.12 , q=kp= a) The standard deviation tor Sample proportion. 0:12X0.88 SB(A) pq n

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