A researcher wishes to test the effectiveness of a flu vaccination. 150 people are vaccinated, 180 people are vaccinated with a placebo, and 100 people are not vaccinated. The number in each group who later caught the flu was recorded. The results are shown below.

Find and interpret the relative risk of catching the flu, comparing those who were vaccinated to those in the control group.

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Vaccinated Placebo Control Caught the flu 19 21 Did not catch the flu 142 79 161