Commute times in the u. s. are heavily skewed to the right. we select a random sample of 500 people from the 2000 u. s. census who reported a non-zero commute time. in this sample the mean commute time is 27.6 minutes with a standard deviation of 19.6 minutes. can we conclude from this data that the mean commute time in the u. s. is less than half an hour? conduct a hypothesis test at the 5% level of significance