Exam 1

  1. Metainformation

    Tag Value
    fileDescriptive-statistics_uva-variance-210-en_uva-variance-210-en
    nameuva-variance-210-en
    sectionDescriptive statistics/Summary Statistics/Measures of Spread/Variance
    typeschoice
    solutionFALSE, FALSE, TRUE
    TypeCalculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty3.988
    p-value0.1264

    Question

    For the probability variable X, Var(X) = 3. A new probability variable W is created using the formula W = 2X. The variance of W, Var(W), is now


    1. FALSE: 4
    2. FALSE: 6
    3. TRUE: 12

    1. 4:Incorrect
    2. 6: Incorrect
    3. 12: Correct