Exam 1

  1. Metainformation

    Tag Value
    fileInferential_Statistics_uva-simple-linear-regression-795-en_uva-simple-linear-regression-795-en
    nameuva-simple-linear-regression-795-en
    sectionInferential Statistics/Regression/Simple linear regression
    typeschoice
    solutionFALSE, TRUE, FALSE
    TypeConceptual, Calculation
    LanguageEnglish
    LevelStatistical Literacy
    IRT-Difficulty5.402
    p-value0.0041

    Question

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

    ——– ——– ——– ——– x1 x2 x3 x1 - x2 0.72 - x3 0.01 0.03 - ——– ——– ——– ——–

    The regression equation for the dependent variable y with only x1 and x2 is ŷ=8.75+3.51x1+4.32x2\hat{y} = 8.75 + 3.51x_{1} + 4.32x_{2} Now suppose the model is calculated with x3 added. Then the coefficient


    1. FALSE: Of x1 become much smaller and of x2 become much larger.
    2. TRUE: From x1 remain about the same and from x2 also.
    3. FALSE: From x1 remain about the same and from x2 become much smaller.

    1. From x1 become much smaller and from x2 become much larger…: Incorrect
    2. From x1 remain about the same and from x2 also…: Correct
    3. From x1 remain about the same and for x2 become much smaller…: Incorrect