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4 3 Heart attack is one of the leading causes of death in many countries and cigarette smoking

is the most preventable risk factor for heart attack. In a particular population, 20% of people

suffered a heart attack, 16% of people are current smokers, and 12% of people had a heart

attack while they were smokers. Let event A be a person who is a current smoker and event B

be a person who had heart attack.

a) Construct a Venn diagram to show the relationship between having a heart attack and

current smoking.up

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b) Calculate P(A), P(B), P(AB), and P(AB).

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c) If a person is randomly selected from current smokers, what is the probability that this

person would suffer a heart attack?

d) if a person is randomly selected from current non-smokers, what is the probability that this

person would suffer a heart attack?

e) What is the risk of having a heart attack for current smokers? What is the risk of having a

heart attack for current non-smokers?

f) What is the relative risk of suffering a heart attack for current smokers compared to current

non-smokers? What is the relative risk comparing current non-smokers to current smokers?

g) What are the odds of having a heart attack among those who are current smokers? What are

the odds of having a heart attack among current non-smokers?

h) What is the odds ratio of having a heart attack for current smokers compared to current non-

smokers? What would be the odds ratio comparing current non-smokers to current smokers?