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Math Help - Using table to decipher answer in stats

  1. #1
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    Using table to decipher answer in stats

    TABLE describes the smoking habits of a group of asthma suferers

    occasional Regular Heavy
    non smoker Smoker Smoker Smoker total
    MEN 433 42 71 37 583

    WOMEN 326 47 78 39 490

    total 759 89 149 76 1073


    Q1 iF 1 of the people is randomly selescted,find the Prblty that the person is a man OR heavy smoker

    I come out with 620/1073 Is this right?

    Q2 If one person is selected at random, find the probability that the person is a woman OR regular smoker

    I come out w/ 568/173 Is this right ?

    Q3 If one person is selected at random, find the Prob that the perso n is a man an a non smoker

    ??????

    Q4 What is the prob that a person is a non smoker, given that the person is a woman


    I come out w/ 490/759 Is this right ?


    Q5 What is the Prob that a person IS a woman, Given that the person is a heavy smoker

    I come out w/ 76/490 Is this right ?
    Last edited by Cribster01; February 5th 2008 at 06:25 PM.
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  2. #2
    GAMMA Mathematics
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    Quote Originally Posted by Cribster01 View Post
    TABLE describes the smoking habits of a group of asthma suferers

    occasional Regular Heavy
    non smoker Smoker Smoker Smoker total
    MEN 433 42 71 37 583

    WOMEN 326 47 78 39 490

    total 759 89 149 76 1073
    Match my numbers up in each answer with the table to see why I chose the numbers I chose.

    Quote Originally Posted by Cribster01 View Post
    Q1 iF 1 of the people is randomly selescted,find the Prblty that the person is a man OR heavy smoker

    I come out with 620/1073 Is this right?
    Nope, \frac{583+39}{1073}=\frac{622}{1073}

    Quote Originally Posted by Cribster01 View Post
    Q2 If one person is selected at random, find the probability that the person is a woman OR regular smoker

    I come out w/ 568/173 Is this right ?
    Nope, \frac{490+71}{1073}=\frac{561}{1073}

    Quote Originally Posted by Cribster01 View Post
    Q3 If one person is selected at random, find the Prob that the perso n is a man an a non smoker

    ??????

    \frac{433}{1073}

    Quote Originally Posted by Cribster01 View Post
    Q4 What is the prob that a person is a non smoker, given that the person is a woman


    I come out w/ 490/759 Is this right ?
    Nope, you must pick the non-smoking women out of the women (men were eliminated in the question), \frac{326}{490}


    Quote Originally Posted by Cribster01 View Post
    Q5 What is the Prob that a person IS a woman, Given that the person is a heavy smoker

    I come out w/ 76/490 Is this right ?
    Similar to last question, \frac{39}{76}
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