The Municipal Transit Authority wants to know if, on weekdays, more passengers ride the northbound blue line train towards the city center that departs at 8:15 a.m. or the one that departs at 8:30 a.m. The following sample statistics are assembled by the Transit Authority. n S 8:15 a.m. train 30 323 41 8:30 a.m. train 45 356 45 a. Construct the 90% confidence interval for the difference in the mean number of daily travelers on the 8:15 train and the mean number of daily travelers on the 8:30 train. b. Test at the 5% level of significance whether the data provide sufficient evidence to conclude that more passengers ride the 8:30 train. c. Compute the observed significant of the test