Solve the following:
Q: 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
|
43
|
41
|
|
2
|
51
|
49
|
|
3
|
37
|
44
|
|
4
|
24
|
32
|
|
5
|
47
|
46
|
|
6
|
44
|
42
|
|
7
|
50
|
47
|
|
8
|
55
|
51
|
|
9
|
46
|
49
|
Use the data to compute a 90% confidence interval to estimate the population average difference. Assume ridership is normally distributed