Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-addition-rule-745-en_uva-addition-rule-745-en
    nameuva-addition-rule-745-en
    sectionProbability/Elementary Probability/General Rules/Addition rule
    typeschoice
    solutionTRUE, FALSE, FALSE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty2
    p-value0.5905

    Question

    Two cognitive behavioral therapists give the same treatment to similar patients. Annually, behavioral therapist X treats 250 patients, 10 of whom do not recover from their mental state. Behaviorist Y, on the other hand, sees 375 patients annually of whom 30 do not recover. Suppose that at the end of a year, a non cured patient is selected at random. What is then the probability that this non cured patient has been under the treatment of therapist X?


    1. TRUE: 1/4
    2. FALSE: 3/8
    3. FALSE: 2/5
    4. FALSE: 3/4

    1. 1/4:Correct
    2. 3/8: Incorrect
    3. 2/5: Incorrect
    4. 3/4: Incorrect