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6. Consider the linear population model with intercept:$y_t = \alpha + \beta x_t + \varepsilon_t$The variance structure is known as below: $E(\varepsilon_t^2) = \sigma^2 h_t^2,$Which regression may obtain efficiency $\hat{\beta}$ estimator? (A) Regress \( y_{t} \) on 1, \( x_{t} \) (B) Regress \( y_{t} / h_{t} \) on 1/ht ,xt/ht(C) Regress \( y_{t} / h_{t}^{2} \) on 1/h2t ,xt/h2t(D) Regress \( y_{t} \) on 1/ht ,xt/ht(E) Regress \( y_{t} / h_{t} \) on 1, \( x_{t} \)

5. Consider the linear model with intercept: $y_t = \alpha + \beta x_t + u_t$ If the $A = \sum_{i=1}^{n} (x_i - \bar{x})^2$ is positive definite and $E(u_i \mid x_i) = 0, \forall t = 1, 2, \dots, T$, which statement is true under sample size $T \to \infty$. (A) \( \hat{\beta} \) is consistent, but we cannot judge whether \( \hat{\beta} \) is efficiency (B) \( \hat{\beta} \) is unbiased and efficiency (C) \( \hat{\beta} \) is consistent and efficiency (D) \( \hat{\beta} \) is, but we cannot judge whether \( \hat{\beta} \) is efficiency (E) \( \hat{\beta} \) is unbiased and consistent.

4. Consider the simple regression $y_i = \alpha + \beta x_i + \varepsilon_i$And suppose population parameter $\beta = 2$ and least square estimator $\hat{\beta} = 2.3$. Now consider the regression $(x_i - y_i) = \alpha^* + \beta^* x_i + u_i.$What is the value of \( \hat{\beta} \)? (A) 1 (B)-1 (C)-1.3 (D)-0.3 (E) 0.3

五、請說明國道電子收費與外部性的關係，並分析尖峰和非尖峰時段是否應收取相同費率。(15 分)

四、政府實行所得重分配政策是否可以提高經濟效率？為什麼？(20 分)

三、社會安全退休年金制度對個人儲蓄行為有哪些可能的影響？(15 分)

(測試用)國中數學測試

講師：tina

簡介：國中數學描述國中數學描述國中數學描述國中數學描述國中數學描述 國中數學描述國中數學描述國中數學描述 國...

國中教育會考自然科

講師：【站僕】摩檸Morning.

簡介：國中地球科學 理化 生物

會計學(含中級會計學)

講師：解答在私人筆記，請按讚！

簡介：提供給對學習會計學有興趣的人士（沒有學過的也可以看，從頭教起！)，不管是在學、升學（如：四技二專的入...

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28. 依據法之起源，區別法之種類可分為下列何者？ (A)成文法與不成文法(B)一般法與特別法 (C)強行法與任意法 (D)固有法與繼受法

複選題59.(AB) In practice, frequent changes in direction under successive presidential administrations have disrupted the continuity necessary for such ambitious undertakings. (AC) Commercial commitments, international commitments and now the government—all three working together is what’s really enabled humans to get to this point. (AD) The United States’ former rivalry with the Soviet Union has transitioned into a more complex competition involving a diverse array of nations with their own strategic lunar objectives. (AE) While Artemis II is a lunar flyby rather than a landing, it marks a significant milestone: the first crewed mission to the lunar vicinity since the Apollo program in 1972. (BC) Much of the industrial infrastructure and specialized expertise that supported the Apollo missions no longer exists, making a direct replication of 1960s technology impractical. (BD) The protracted interval between these landmark missions is fundamentally a byproduct of oscillating political will and shifting national priorities.   (BE) This shift requires the development of durable habitats and adaptable landing systems capable of operating in the lunar environment for extended periods.

25. A: Sorry, I'm late. Have you _______ long? B: That's ok. (A) are waiting (B) were waiting (C) been waiting (D) has waited

26. A: I am so tired today. B: You _______ have gone to bed so late. (A) can (B) can't (C) should (D) shouldn't

27. A: It's Monday today, _______ it? B: No, it isn't. (A) isn't (B) aren't (C) can't (D) hasn't

(四)變更後，瞄子後座力之變化值（kgf）。（7分）