Exam 1

  1. Metainformation

    Tag Value
    fileDescriptive-statistics_uva-variance-218-en_uva-variance-218-en
    nameuva-variance-218-en
    sectionDescriptive statistics/Summary Statistics/Measures of Spread/Variance
    typeschoice
    solutionTRUE, FALSE, FALSE
    TypeCalculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty4.02
    p-value0.1114

    Question

    Given is the following table

    ———- —– —– —– —– X 1 2 3 4 P(X = x) 0.2 0.3 0.3 0.2 ———- —– —– —– —–

    The variance of the probability variable X, Var(X), is


    1. TRUE: 1.05
    2. FALSE: 2.5
    3. FALSE: 6.25

    1. 1.05: Correct
    2. 2.5: Incorrect
    3. 6.25: Incorrect