Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_uva-simple-linear-regression-887-en_uva-simple-linear-regression-887-en
    nameuva-simple-linear-regression-887-en
    sectionInferential Statistics/Regression/Simple linear regression
    typeschoice
    solutionFALSE, TRUE, FALSE
    TypeConceptual, Calculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty4.41
    p-value0.0294

    Question

    Given is the table of correlations for three predictors x1, x2 and x3.

    ——– ——– ——– ——– x1 x2 x3 x1 - x2 0.01 - x3 0.03 0.05 - ——– ——– ——– ——–

    The regression equation for the dependent variable y with only x1 and x3 is ŷ=12.44+4.91x1+2.01x3\hat{y} = -12.44 + 4.91x_{1} + 2.01x_{3} Now suppose the model is calculated with x2 added. Then the coefficient


    1. FALSE: Of x1 become much smaller and of x3 become much larger .
    2. TRUE: From x1 remain about the same and from x3 also .
    3. FALSE: Of x1 remain about the same and for x3 become much smaller.

    1. Become much smaller from x1 and much larger from x3: Incorrect
    2. From x1 stay about the same and from x3 also : Correct
    3. From x1 remain about the same and from x3 become much smaller…: Incorrect