A magazine provided results from a poll of 59 adults who were asked to identify their favorite pie. Among the ​respondents, 28​% chose chocolate​ pie. If the confidence level is 95​%, calculate the confidence interval for the proportion of adults who identify chocolate pie as their favorite pie. Enter the upper bound of the confidence interval as a percentage without the % sign. (Round your percentage to the nearest tenth.)

You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you​ survey? Assume that you want to be 95% confident that the sample percentage is within 2.3 percentage points of the true population percentage.

You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you​ survey? Assume that a prior survey suggests that about 11​% of air passengers prefer an aisle seat. Assume that you want to be 90% confident that the sample percentage is within 4.9 percentage points of the true population percentage.