Exam 1

  1. Metainformation

    Tag Value
    fileDescriptive-statistics_uva-variance-260-en_uva-variance-260-en
    nameuva-variance-260-en
    sectionDescriptive statistics/Summary Statistics/Measures of Spread/Variance
    typeschoice
    solutionFALSE, TRUE, FALSE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty3.726
    p-value0.1671

    Question

    We draw a sample of n = 11 from a distribution with μ = 88 and σ2 = 25. Then, for the expectation and variance of the sample mean:


    1. FALSE: Μ = 8 and σ2 = 7.54
    2. TRUE: Μ = 88 and σ2 = 2.27
    3. FALSE: Μ = 88 and σ2 = 7.54
    4. FALSE: Μ = 88 and σ2 = 25

    1. Μ = 8 and σ2 = 7.54: Incorrect
    2. Μ = 88 and σ2 = 2.27: Correct
    3. Μ = 88 and σ2 = 7.54: Incorrect
    4. Μ = 88 and σ2 = 25: Incorrect