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The data file Elecmart.x/sx provides information on 400 customer orders during a period of several months for E-mart. Suppose these customers are a random sample

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The data file Elecmart.x/sx provides information on 400 customer orders during a period of several months for E-mart. Suppose these customers are a random sample for E-mart. Please obtain the sample proportion of customers from MidWest region using Excel. The lower limit of a 99% confidence interval estimate of the proportion of all E-mart customers who are from MidWest region is (Please keep all workings to at least 4 decimal places. State your final answer to 3 decimal places) Check

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