You are studying the effects of smoking by pregnant women on rates of asthma in their children. You collect data on the number of cigarettes smoked per day and whether or not the child developed asthma by the age of two. The data is below:
Smoked 1-5 cigarettes per day --- 9.5% developed asthma
Smoked 6-10 cigarettes per day --- 10.1% developed asthma
Smoked 11-20 cigarettes per day --- 24.8% developed asthma
Smoked 21-40 cigarettes per day --- 35.5% developed asthma
Smoked 41-60 cigarettes per day --- 38.4% developed asthma
Average number of cigarettes smoked per day
3
8
15.5
30.5
50.5
Percentage of children developed asthma
9.5%
10.1%
24.8%
35.5%
38.4%