Exhibit 11-2 The results ofa recent study regarding smoking and three types of i

Question

Exhibit 11-2 The results ofa recent study regarding smoking and three types of illness are shown in the following table. Non-Smokers Illness Smokers Totals Emphysema 60 80 Heart problem 70 80 150 Cancer Totals 120 180 300 We are interested in determining whether or not illness is independent of smoking. 14. Refer to Exhibit 11-2. The expected frequency of those who have Emphysema and do not smoke is a. 32 b. 48 c, 28 d. 422 ANS: A 15. Refer to Exhibit 11-2. The expected frequency of those who have Cancer and smoke is a. 32 b. 48 c.. 28 d. 42 ANS: D 16. Refer to Exhibit 11-2. The value of the test statistic is a. 13.084 b. 10.516 c. 8.496 d. 2.645 ANS: B 17. Refer to Exhibit 11-2. The number of degrees of freedom associated with this test is

Explanation / Answer

Answer to question# 14)

Formula of expected frequency is :

Row total * Column total / grand total

Thus expected probability of (Ephysema & no Smoke) = 120 * 80 / 300

Expected frequency = 32

Thus the correct answer choice is : A.

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