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In a marketing survey, a random sample of 1001 supermarket shoppers revealed that 273 always stock up on an item when they find that item at a real bargain price. (Source: Trends in the United States: Consumer Attitudes and the Supermarket, The Research Department, Food Marketing Institute). A. Find a 70% confidence interval for the proportion of all supermarket shoppers who stock up on an item they find at a real bargain price. 1. What is the point estimate for the population proportion? What is the complement of the point estimate? Round the values to four decimal places. p= 9 = I1. What is the critical value that corresponds to 70%? Zo.70 = Ill. What is the margin of error? Use the point estimate from part A.I. to calculate. Round to four decimal places. E = IV. Complete the confidence interval. Use the values found in parts A.I. and A.Ill. to complete. Round to four decimal places. p