Proportion of defective cell phones

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Reference no: EM131870255

A quality control inspector for a company that makes cell phones needs to estimate the proportion of defective cell phones produced by the company. The quality control inspector estimates that the proportion defective is about 0.1, corresponding to 10% defective. How many of the company's cell phones should be sampled and checked in order to estimate the proportion of defective cell phones to within 0.01 with 90% confidence?

Reference no: EM131870255

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