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 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 ( ) Answer

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

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