Los Angeles Valley College Poll Data processing Statistics Exercise

1. A magazine provided results from a poll of 22 adults who were asked to identify their favorite pie. Among the respondents, 36% chose chocolate pie. If the confidence level is 98%, calculate the confidence interval for the proportion of adults who identify chocolate pie as their favorite pie.

Enter the lower bound of the confidence interval as a percentage without the % sign. (Round your percentage to the nearest tenth.)

2. 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 5.8 percentage points of the true population percentage.

3. 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 98% confident that the sample percentage is within 4.7 percentage points of the true population percentage.