Exam 1

  1. Metainformation

    Tag Value
    fileProbability_uva-general-rules-957-en_uva-general-rules-957-en
    nameuva-general-rules-957-en
    sectionProbability/Elementary Probability/General Rules
    typeschoice
    solutionFALSE, FALSE, TRUE, FALSE, FALSE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty1.997
    p-value0.7762

    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 in a million has DNA that matches the DNA of the perpetrator. A suspect is found. Define the events
    * A = the person’s DNA matches the offender’s DNA. * B = the person found is innocent.  Then what is the probability that the person found is innocent and his DNA matches that of the perpetrator?


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

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