S/F Ekonometri Ch 11.1

7 Questions | Total Attempts: 47

SettingsSettingsSettings
Please wait...
S/F Ekonometri Ch 11.1


Questions and Answers
  • 1. 
    In the presence of heteroscedasticity OLS estimators are biased as well as inefficient.
    • A. 

      True

    • B. 

      False

  • 2. 
    If heteroscedasticity is present, the conventional t and F tests are invalid.
    • A. 

      True

    • B. 

      False

  • 3. 
    In the presence of heteroscedasticity the usual OLS method always over estimates the standard errors of estimators.
    • A. 

      True

    • B. 

      False

  • 4. 
    If residuals estimated from an OLS regression exhibit a systematic pattern, it means heteroscedasticity is present in the data.
    • A. 

      True

    • B. 

      False

  • 5. 
    There is no general test of heteroscedasticity that is free of any assumption about which variable the error term is correlated with.
    • A. 

      True

    • B. 

      False

  • 6. 
    If a regression model is mis-specified (e.g., an important variable is omitted), the OLS residuals will show a distinct pattern.
    • A. 

      True

    • B. 

      False

  • 7. 
    If a regressor that has nonconstant variance is (incorrectly) omitted from a model, the (OLS) residuals will be heteroscedastic.
    • A. 

      True

    • B. 

      False

Back to Top Back to top