Problem
In a cross-sectional study of the relationship between smoking and anxiety, 1000 women were classified according to smoking status and current level of anxiety.
|
|
High anxiety level
|
Low anxiety level
|
Totals
|
|
Smoker
|
200
|
300
|
500
|
|
Nonsmoker
|
100
|
400
|
500
|
|
Totals
|
300
|
700
|
1000
|
What is the overall prevalence of smoking in the total population?