create a 95% confidence interval

In a listing of 12 arrival delays (minutes) for randomly selected American Airlines flights from New York (JFK) to Los Angeles the sample mean was -9.167 minutes and the sample standard deviation was 23.863 minutes. Negative numbers correspond to flights that arrived before the scheduled arrival time. Create a 95% confidence interval that helps people determine how good the on-time performance is, Show one limit calculation in the following equation box. Remember to use StatCrunch and scrap paper