Answer:
Sample relative risk is 4.
Step-by-step explanation:
We are given the following in the question:
Group 1 of smokers: 10 out of 100 get lung cancer.
[tex]\text{P(Lung cancer for smoker)} = \dfrac{10}{100} = \dfrac{1}{10}[/tex]
Group 2 of non-smokers: 5 out of 200 get lung cancer
[tex]\text{P(Lung cancer for non-smoker)} = \dfrac{5}{200} = \dfrac{1}{40}[/tex]
Sample relative risk:
Sample relative risk =
[tex]\dfrac{\text{P(lung cancer for smokers)}}{\text{P(lung cancer for non smokers)}}\\\\=\dfrac{\frac{1}{10}}{\frac{1}{40}} = \dfrac{40}{10} = 4[/tex]
Thus, sample relative risk is 4.