Producers of pvc pipes want to have a supply of pipes

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Producers of PVC pipes want to have a supply of pipes sufficient to meet marketing needs. They wish to survey wholesalers who buy them in order to estimate the proportion who plan to increase their purchases next yaer. What sample size is requred if they want their estimate to be within .04 of the actual proportion with probability equal to .90?

Reference no: EM13623233

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