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A study is conducted to estimate the average difference in bus ridership for a large city...

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.

Bus Morning Afternoon

1

 47 41

2

 51 48

3

 37 44

4

 24 32

5

 48 46

6

 44 39

7

 50 47

8

 55 49

9

 49 49


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

≤ D ≤

math   Statistics-And-Probability   
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