Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-conditional-probability-958-en_uva-conditional-probability-958-en
    nameuva-conditional-probability-958-en
    sectionProbability/Elementary Probability/Conditional probability
    typeschoice
    solutionFALSE, FALSE, FALSE, FALSE, FALSE, TRUE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty2.507
    p-value0.4683

    Question

    A crime has been committed, and it is known that the criminal is part is part of a population of 6 million. Through research, the police know that only one person per million has DNA that matches the DNA of the perpetrator. Define the events:‖
    * A = the DNA of a randomly selected person matches the DNA of the offender. * B = the person chosen is innocent.  Then what is the probability that the police will choose a person who is innocent, given that his DNA matches that of the perpetrator?


    1. FALSE: 1/6,000,000
    2. FALSE: 1/1,000,000
    3. FALSE: 5/6,000,000
    4. FALSE: 5/1,000,000
    5. FALSE: 1/6
    6. TRUE: 5/6

    1. 1/6,000,000: Incorrect
    2. 1/1,000,000: Incorrect
    3. 5/6,000,000: Incorrect
    4. 5/1,000,000: Incorrect
    5. 1/6: Incorrect
    6. 5/6: Correct