An experiment designed to study the relationship between hypertension and cigarette smoking yielded the following data.
|
|
Nonsmoker
|
Moderate Smoker
|
Heavy Smoker
|
|
Hypertension
|
20
|
38
|
28
|
|
No hypertension
|
50
|
27
|
18
|
Test the hypothesis that whether or not an individual has hypertension is inde- pendent of how much that person smokes.