The Homoskedasticity-Only Estimator of the Variance Of $\hat { \beta }$

question 41

Multiple Choice

The homoskedasticity-only estimator of the variance of $\hat { \beta }$ ₁ is

• A) \(\frac { s _ { u } ^ { \frac { 2 } { u } } } { \sum _ { i = 1 } ^ { n } \left( X _ { i } - \bar {X } \right) ^ { 2 } }\)
• B) \(\frac { S _ { \hat { u } } ^ { 2 } } { \sqrt { \sum _ { i = 1 } ^ { n } \left( X _ { i } - \bar { X } \right) ^ { 2 } } }\)
• C) \(\frac { S _ { \hat { u } } ^ { 2 } } { \sum _ { i = 1 } ^ { n } X _ { i } ^ { 2 } - \bar { X } } .\)
• D) \(\frac { 1 } { n } \times \frac { \frac { 1 } { n - 2 } \sum _ { i = 1 } ^ { n } \left( X _ { i } - \bar { X } \right) ^ { 2 } \hat { u } _ { i } ^ { 2 } } { \left[ \frac { 1 } { n } \sum _ { i = 1 } ^ { n } \left( X _ { i } - \bar { X } \right) ^ { 2 } \right] ^ { 2 } } { } _ { \times }\)

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