Exam 1

  1. Metainformation

    Tag Value
    fileDescriptive-statistics_uva-variance-237-en_uva-variance-237-en
    nameuva-variance-237-en
    sectionDescriptive statistics/Summary Statistics/Measures of Spread/Variance
    typeschoice
    solutionTRUE, FALSE, FALSE
    TypeCalculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty3.661
    p-value0.1774

    Question

    In two random samples from a normally distributed population (n1 = 10 and n2 = 30) one finds S12 = 50 and S22 = 40. A weighted estimate of the population variance σ2 then has the value


    1. TRUE: 42.37
    2. FALSE: 45
    3. FALSE: 47.63

    1. 42.37: Correct
    2. 45: Incorrect
    3. 47.63: Incorrect