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A cell phone manufacturer would like to know what proportion

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A cell phone manufacturer would like to know what proportion of its customers is dissatisfied with the service received from their local distributor. The customer’s relations department will survey a random sample of customers and compute a 99% confidence interval for the proportion that are dissatisfied. Form past studies they believe that this portion will be about 0.1. find the sample size needed if the margin of error of the confidence interval is to be about 0.015. suppose 15% of the sample say they are dissatisfied. What is the margin of error of the 99% confidence interval?