lecture11-2

# Then we can easily compute the other three cells by

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Unformatted text preview: The two categorical variables measured on each subject are: variable A: did the subject chew Nicorette or the placebo? (explanatory variable) variable B: did the subject get a sore throat? (response variable) What values should we expect to see in the contingency table if we assume INDEPENDENCE? sore throat no sore throat total Nicorette 150 placebo 150 total 84 216 300 € NOTICE: All we have to do is compute the value in one of the four cells. Then we can easily compute the other three cells by using subtraction. If there is no difference between Nicorette and the placebo, the same rates (or risks) should apply in each row. The rate of sore throats is 84/300 = 28%. Thus, out...
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## This document was uploaded on 12/11/2013.

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