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Math Help - need help with this staticstics question (point me in right dirrection please)

  1. #1
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    need help with this staticstics question (point me in right dirrection please)

    Hello, sort of left an assignment to the last minute and am in desperate need of help
    The results are in for the paper toss game and we have found that each participant's accuracy
    (closeness to the coin) is dependent on the weight of the paper used as a ball. To show the
    distinction, we have constructed the following contingency table from 200 samples:
    Wc W
    D 84 22
    Dc 36 58
    where W is the weight of the paper is less than 80 gsm, and D is the distance recorded is less
    than or equal to 20 cm from a paper toss.
    Note: you are allowed to use the text book probability tables when answering these questions.
    When a table lookup has been performed, make it obvious by writing `from Table x', where x is
    replaced by the table number used or the page number.
    1 Probabilities
    From the above contingency table, compute:
    1. the probability that the distance is less than or equal to 20 cm and the weight is greater
    than or equal to 80 gsm.
    2. the probability that the distance is greater than 20 cm and the weight is greater than or
    equal to 80 gsm.
    3. the probability that the distance is less than or equal to 20 cm given that the weight is
    greater than or equal to 80 gsm.
    4. the probability that the distance is less than or equal to 20 cm given that the weight is less
    that 80 gsm.
    i dont get the whole table part, i know c = the event that it doesnt occur so am i suppose to put like probability 22 that both occur ? or is there an equation that i need to do? help will be greatly appreciated thanks.
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  2. #2
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    Re: need help with this staticstics question (point me in right dirrection please)

    Quote Originally Posted by nitros View Post
    Hello, sort of left an assignment to the last minute and am in desperate need of help
    The results are in for the paper toss game and we have found that each participant's accuracy
    (closeness to the coin) is dependent on the weight of the paper used as a ball. To show the
    distinction, we have constructed the following contingency table from 200 samples:
    Wc W
    D 84 22
    Dc 36 58
    where W is the weight of the paper is less than 80 gsm, and D is the distance recorded is less
    than or equal to 20 cm from a paper toss.
    Note: you are allowed to use the text book probability tables when answering these questions.
    When a table lookup has been performed, make it obvious by writing `from Table x', where x is
    replaced by the table number used or the page number.
    1 Probabilities
    From the above contingency table, compute:
    1. the probability that the distance is less than or equal to 20 cm and the weight is greater
    than or equal to 80 gsm.
    2. the probability that the distance is greater than 20 cm and the weight is greater than or
    equal to 80 gsm.
    3. the probability that the distance is less than or equal to 20 cm given that the weight is
    greater than or equal to 80 gsm.
    4. the probability that the distance is less than or equal to 20 cm given that the weight is less
    that 80 gsm.
    i dont get the whole table part, i know c = the event that it doesnt occur so am i suppose to put like probability 22 that both occur ? or is there an equation that i need to do? help will be greatly appreciated thanks.
    Please read rule #6: http://www.mathhelpforum.com/math-he...hp?do=vsarules)

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