Exam 1

  1. Metainformation

    Tag Value
    fileDescriptive-statistics_uva-variance-338-en_uva-variance-338-en
    nameuva-variance-338-en
    sectionDescriptive statistics/Summary Statistics/Measures of Spread/Variance
    typeschoice
    solutionFALSE, TRUE, FALSE, FALSE
    TypeConceptual
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty3.735
    p-value0.165

    Question

    We denote the weight of a person in pounds by the stochastic variable Y. In a given population, μY = 140 and σ2Y = 900. We now want to represent the weights in kilograms and use the variable X for this purpose. In this population, expectation μX and variance σ2X:


    1. FALSE: ΜX = 70 and σ2X = 450
    2. TRUE: ΜX = 70 and σ2X = 225
    3. FALSE: ΜX = 140 and σ2X = 225
    4. FALSE: ΜX = 280 and σ2X = 3600

    1. ΜX = 70 and σ2X = 450: Incorrect
    2. ΜX = 70 and σ2X = 225: Correct
    3. ΜX = 140 and σ2X = 225: Incorrect
    4. ΜX = 280 and σ2X = 3600: Incorrect