Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-conditional-probability-627-en_uva-conditional-probability-627-en
    nameuva-conditional-probability-627-en
    sectionProbability/Elementary Probability/Conditional probability
    typeschoice
    solutionFALSE, FALSE, FALSE, TRUE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty2
    p-value0.5905

    Question

    Three hundred patients were treated for insomnia using one of three methods A, B or C. After completing treatment, they were asked for their opinion about the treatment. The results are shown in the following cross tabulation:

    ———— ———– ———– ———– —– method A method B method C 45 60 177 34 31 80 21 9 43 100 100 100 300 ———— ———– ———– ———– —–

    One person is randomly drawn from these 300 individuals. We define the following two events:Ê A: the person was treated with method A. B: the person’s assessment of his method was: "good”.  P(B) =


    1. FALSE: 59%
    2. FALSE: 24%
    3. FALSE: 41%
    4. TRUE: 72%

    1. 59%: Incorrect
    2. 24%: Incorrect
    3. 41%: Incorrect
    4. 72%: Correct