I really need some help on this statistics question on 90% confidence interval.

Refer to the accompanying data set of mean drive-through service times at dinner in seconds at two fast food restaurants. Construct a 90% confidence interval estimate of the mean drive-through service time for Restaurant X at dinner; then do the same for Restaurant Y. Compare the results. Click the icon to view the data on drive-through service times. Construct a 90% confidence interval of the mean drive-through service times at dinner for Restaurant X. sec