The Homoskedasticity-Only F-Statistic Is
A) B) $\frac{(R \hat{\beta}-\mathrm{r})^{\prime}\left[R^{\prime}\left(X^{\prime} X\right)^{-1} R\right]^{-1}(R \hat{\beta}-r)}{\mathrm{s}_{\mathrm{u}}^{2}}$

question 46

Multiple Choice

The homoskedasticity-only F-statistic is

• A) \(\frac{(R \hat{\beta}-\mathrm{r})^{\prime}\left[R^{\prime}\left(\mathrm{X}^{\prime} \mathrm{X}\right)^{-1} R\right]^{-1}(R \hat{\beta}-r) / q}{\mathrm{~s}_{\mathrm{u}}^{2}}\)
• B) \(\frac{(R \hat{\beta}-\mathrm{r})^{\prime}\left[R^{\prime}\left(X^{\prime} X\right)^{-1} R\right]^{-1}(R \hat{\beta}-r)}{\mathrm{s}_{\mathrm{u}}^{2}}\)
• C) \(\frac{(R \hat{\beta}-\mathrm{r})^{\prime}\left[R^{\prime} \hat{\Sigma}_{\beta} R\right]^{-1}(R \hat{\beta}-r)}{\mathrm{q}}\)
• D) \(\frac{\hat{\mathrm{U}} \mathrm{P} Z \hat{\mathrm{U}}}{\hat{\mathrm{U}^{\prime} \mathrm{M}_{\mathrm{Z}} \mathrm{U}}}\)

---

Definitions:

Low-Density Lipoprotein

Often referred to as "bad" cholesterol, a type of lipoprotein that transports cholesterol to tissues, which can lead to plaque build-up in arteries.

High-Density Lipoprotein

High-Density Lipoprotein (HDL) is considered the "good" cholesterol, helping to remove other forms of cholesterol from your bloodstream.

Tachycardia

A condition that involves a heart rate that is abnormally fast.

Brachiocephalic

Pertaining to the brachiocephalic artery or vein, which are major blood vessels in the neck and upper chest that supply blood to the head, neck, and arms.