Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-random-variables-405-en_uva-random-variables-405-en
    nameuva-random-variables-405-en
    sectionProbability/Elementary Probability/Random variables
    typeschoice
    solutionFALSE, FALSE, TRUE, FALSE
    TypeCalculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty1.234
    p-value0.8783

    Question

    50 Patients are randomly nursed on one of two types of mattresses, and after three days they are assessed for signs of pressure ulcers. (bedsores):

    ————— ——————- ————————- frequency some pressure ulcers (D) no pressure ulcers (not D) mattress type I 8 12 mattress type II 10 20 ————— ——————- ————————-

    The probability of pressure ulcers, given that mattress type I was used, P(D|I), is equal to


    1. FALSE: 0.16
    2. FALSE: 0.33
    3. TRUE: 0.4
    4. FALSE: 0.44

    1. 0.16: Incorrect
    2. 0.33: Incorrect
    3. 0.4: Correct
    4. 0.44: Incorrect