The american heart association is about to conduct an anti-smoking campaign and wants to know the fraction of americans over 41 who smoke. step 1 of 2: suppose a sample of 830 americans over 41 is drawn. of these people, 673 don't smoke. using the data, estimate the proportion of americans over 41 who smoke. enter your answer as a fraction or a decimal number rounded to three decimal places. step 2. suppose a sample of 830 americans over 41 is drawn. of these people, 673 don’t smoke. using the data, construct the 80% confidence interval for the population proportion of americans over 41 who smoke. lower bound: upper bound: