The correct answer is B.
There's no statically significant association between the exposure and the disease. The risk ratio does not follow the normal distribution, even it does not depend on sample size in comparison groups. The natural rr is approximately normally distributed and is used to produce confidence interval which is for the relative risk.
Chemical elements are important to living organisms because they make up the organic molecules that are found in all living things
Two functions of the skeleton system are:
- It is a support structure for the body
- It provides protection our internal organs
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