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    Calculating and explaining the probabilities of smoking by race

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    5.74 Refer to the contingency table shown below.

    (a) Calculate each probability (i-vi) and explain in words what it means.

    i. P(S) ii. P(W) iii. P(S | W)
    iv. P(S | B) v. P(S and W) vi. P(N and B)

    Smoking by Race for Males Aged 18-24
    Smoker non smoker
    (S) (N) Row Total
    White (W) 290 560 850
    Black (B) 30 120 150
    Column Total 320 680 1000

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