A small appliance repair shop can special order parts from any one of four different suppliers. The
manager of the shop is concerned about the length of time that it takes to special-order a part from
these suppliers, as customer satisfaction is often determined by how quickly the repair to the appliance
is carried out.
The manager decides to conduct an experiment to investigate the time it takes to special-order parts
from the four suppliers. The number of days it takes to special-order a part is recorded for six randomly
selected orders from each of the four suppliers:
A
2
5
8
6
9
3
B
7
8
6
2
3
4
Suppliers
с
2
4
3
9
5
D
3
3
2
3
3
Is there a difference in the mean delivery times for special-order parts from the four different
suppliers? Test the appropriate hypothesis using the 5% level of significance.
