Exam 1

  1. Metainformation

    Tag Value
    fileDistributions_uva-normal-1333-en_uva-normal-1333-en
    nameuva-normal-1333-en
    sectionDistributions/Continuous/Normal
    typeschoice
    solutionFALSE, TRUE, FALSE, FALSE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty2.714
    p-value0.4368

    Question

    The distribution of the number of children per family in the U.S. has a mean of 0.9 and a standard deviation of 1.1. If you take a random sample of 20 families in the U.S., what is the probability that there are a total of 40 or fewer children in the sample? (z is normally distributed by default).


    1. FALSE: P(z ≤ 1.5)
    2. TRUE: P(z ≤ 6.3)
    3. FALSE: P(z ≥ 6.3)
    4. FALSE: P(z = 6.3)
    5. FALSE: P(z ≤ 40)

    1. P(z ≤ 1.5): Incorrect
    2. P(z ≤ 6.3): Correct
    3. P(z ≥ 6.3): Incorrect
    4. P(z = 6.3): Incorrect
    5. P(z ≤ 40): Incorrect