In a clinical trial of 2118 subjects treated with a certaindrug, 22 reported headaches. In a control group of

1618 subjects given aplacebo, 27 reported headaches. Denoting the proportion of headaches in the treatment group by ptand denoting the proportion of headaches in the control(placebo) group by

pc, the relative risk is pt/pc. The relative risk is a measure of the strength of the effect of the drug treatment. Another such measure is the oddsratio, which is the ratio of the odds in favor of a headache for the treatment group to the odds in favor of a headache for the control(placebo) group, found by evaluating pt/1ptpc/1pc. The relative risk and odds ratios are commonly used in medicine and epidemiological studies. Find the relative risk and odds ratio for the headache data. What do the results suggest about the risk of a headache from the drugtreatment?