1. In a marketing survey, a random sample of 1001 supermarket shoppers revealed that 273 always stock up on an item when they nd 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 95% confidence interval for the proportion of all sup ermarket shopp ers who always stock up on an item when they nd a real bargain. b) A voluntary online p oll shows that 21% of all sup ermarket shopp ers always stock up on an item when they nd a real bargain. Are the poll results consistent with the marketing survey results? Explain very clearly your answer.