Answer
Here p = 0.223 and q = 0.131
Using odds ratio, we have:
Odds Ratio = $\frac{p(1-q)}{q(1-p)} = \frac{0.223 (1 - 0.131)}{0.131(1 - 0.223)}$
= $\frac{0.194}{0.102} = 1.91$
This implies that the ratio of reported abstinence in experimental group is almost twice that of the control group.
Work Step by Step
Given above.
