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 table of the expected frequencies. c. Compute the test statistic.

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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

50

70

Heart problem

70

80

150

Cancer

40

40

80

Totals

130

170

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 table of the expected frequencies.
c. Compute the test statistic.
d.  
e.  
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