21. 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 20 60 80

Heart problem 70 80 150

Cancer 30 40 70

Totals 120 180 300

We are interested in determining whether or not illness is independent of smoking.

a. State the null and alternative hypotheses to be tested.

b. Show the contingency table of the expected frequencies.

c. Compute the test statistic.

d. The null hypothesis is to be tested at 95% confidence. Determine the critical value for this test. What do you conclude?

e. Determine the p-value and perform the test.

### Recently Asked Questions

- A firm has an operating profit of $300,000, interest of $35,000, and a tax rate of 40 percent. The firm has an after-tax cost of debt of 5 percent and a cost

- A firm is considering relaxing credit standards, which will result in annual sales increasing from $1.5 million to $1.75 million, the cost of annual sales

- Please refer to the attachment to answer this question. This question was created from untitled.pdf. Additional comments: "Please help"