The data file Elecmart.xlsx 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 South region using Excel. The upper limit of a 95% confidence interval estimateof the proportion of all E-mart customers who are from South region is Answer

(Please keep all workings to at least 4 decimal places. State your final answer to 3 decimal places)

Count of Customer Column Labels E Row Labels E E-mart Other Grand Total MidWest 17 54 71 NorthEast 27 88 115 South 24 69 93 West 26 95 121 Grand Total 94 306 400