Confidence Intervals for Population Proportion: Videos & Practice Problems

As the general manager for a major train service, you want to consider a higher fare for passengers in window seats due to their increasing demand, which is why you need to estimate the percentage of passengers who prefer window seats. Assuming that you know nothing about the percentage of passengers who prefer window seats, how many randomly selected train passengers must you survey to be $95\%$ confident that the sample percentage is within $3$ percentage points of the true population percentage?