A study is conducted to estimate the average difference in bus ridership for a large city during the morning and afternoon rush hours. The transit authority€™s researcher randomly selects nine buses because of the variety of routes they represent. On a given day the number of riders on each bus is counted at 7:45 A.M. and at 4:45 P.M., with the following results.

Use the data to compute a 90% confidence interval to estimate the population average difference. Assume ridership is normallydistributed.

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