The results of a recent study regarding smoking and three types of illness are shown in the following table.
Illness Non-Smokers Smokers Totals
Emphysema 50 150 200
Heart problem 50 150 200
Cancer 100 500 600
Totals 200 800 1000
We are interested in determining whether or not illness is independent of smoking.
- State the null and alternative hypotheses to be tested
- Show the table of the expected frequencies (make a table) and determine the test statistic
- The null hypothesis is to be tested at 95% confidence.
- What do you conclude?