Final

Question 1

Relative Scale
Incidence Density Ratio (Relative Rate Ratio)

Answer 1

The rate of myocardial infarction in the smoking group is 1.36 times the rate in the non-smoking group.
Smokers have a 36% higher rate of MI compared to non-smokers.

Question 2

Relative Scale
Cumulative Incidence Ratio (Relative Risk Ratio)

Answer 2

The risk of myocardial infarction in older people is 2 times or 2 fold or 1-CIR * 100% higher than the the cumulative incidence of myocardial infarction in younger people.

Question 3

Confidence Intervals for Relative Scale

Answer 3

1. CI contains 1, then we fail to reject the null hypothesis and this is not statistically significant.
2. CI does not contain 1, then we reject the null hypothesis and this is statistically signifigant!