In a marketing survey, a random sample of 1002 supermarket shoppers revealed that 270 always stock up on an item when they find that item at a real bargain price. (a) Let p represent the proportion of all supermarket shoppers who always stock up on an item when they find a real bargain. Find a point estimate for p. (Use 3 decimal places.)   (b) Find a 90% confidence interval for p. (Use 3 decimal places.) lower limit   upper limit   (c) What is the margin of error based on a 90% confidence interval? (Use 3 decimal places

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