A supermarket chain is considering two sources A and B for the purchase of 50-pound bags of onions. The following table gives the results of a study.
|
|
Source A
|
Source B
|
|
Number of bags weighed
|
80
|
100
|
|
Mean weight
|
105.9
|
100.5
|
|
Sample variance
|
0.21
|
0.19
|
Test at α = 0.05 whether there is a difference in the mean weights.