The following table is based on samples of patients diagnosed with gastric cancer, peptic ulcer, and controls from the same health maintenance operation.
From the following table, test whether there are significant differences in blood type among the three groups.
|
Blood Type
|
Gastric Cancer
|
Peptic Ulcer
|
Controls
|
|
O
|
400
|
1000
|
3000
|
|
A
|
400
|
700
|
2500
|
|
B
|
75
|
150
|
500
|
|
AB
|
25
|
50
|
200
|
|
Total
|
900
|
1900
|
6200
|