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    kdela1212's Avatar
    kdela1212 Posts: 2, Reputation: 1
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    #1

    Oct 7, 2011, 07:15 PM
    Probability and Statistics homework problem - help?
    Consider a random sample of 125 patients, some of whome have a medical condition and some of whome do not. Results of a new diagnostic tests for the condition are shown.

    Condition Present Condition Absent Row Total
    Test Result 103 22 125
    Test Result - 22 48 70
    Column Total 125 70 195

    Assume that the sample is representative of the entire population. For a person selected at random, find P(getting test result or condition absent). Round your answer to the nearest thousandth.
    CliffARobinson's Avatar
    CliffARobinson Posts: 1,416, Reputation: 101
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    #2

    Oct 7, 2011, 08:22 PM
    We like to help people with homework, but we need you to try your best to work through the problem and ask us questions as you go.
    kdela1212's Avatar
    kdela1212 Posts: 2, Reputation: 1
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    #3

    Oct 9, 2011, 05:24 PM
    I thought it was 103/125 + 70/125
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Oct 9, 2011, 10:58 PM
    I assume that you mean P(Get the test result as positive or Condition absent) ?

    If so, then the number of people who got a positive test result or the number of people who don't have the condition is simply 103 + 22 + 48

    Divide that by the total number of people, 195 to get the answer.
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