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Homework 13
1. A magazine provided results from a poll of 59 adults who were asked to identify their favorite pie. Among the respondents, 43% 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 upper 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 a prior survey suggests that about 33% of air passengers prefer an aisle seat. Assume that you want to be 98% confident that the sample percentage is within 5.7 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 99% confident that the sample percentage is within 3.4 percentage points of the true population percentage.
Homework 13 Answers
1.
1. A magazine provided results from a poll of 59 adults who were asked to identify their favorite pie. Among the respondents, 43% 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 upper bound of the confidence interval as a percentage without the % sign. (Round your percentage to the nearest tenth.)