1. (8分)假設隨機抽樣所來自的母體可以區分成兩類人群，A群與B群。A群人所構成的子母體佔總母體比例為 60% 且其子母體的變異數 σ_A 為7；B群人所構成的子母體佔總母體比例為 40% 且其子母體的變異數 σ_B 為5。考慮隨機從總母體抽出N個人(不分A、B群)，並計算其樣本平均數 Y 。若A、B兩群子母體有相同的母體平均，即 μ_A = μ_B = μ ，則 √N (Y -μ) 的漸近分配為何。(10)

二、請閱讀下列之摘錄文，並詳述其意涵及評論其內容。(25分)Rising rents, stagnant wages, and anemic housing production have led to generation high rent burden rates. Nearly 47 percent of renters across the country (USA) spend more than 30 percent of their household's total income on rent (Harvard Joint Center for Housing Studies 2020). As the crisis worsens and broad relief for renters is slow to materialize, many state and local governments are now considering whether to implement some variation of soft, second-generation rent regulations that limit rent increases (rent stabilization), as opposed to older, first-generation ones that mandate hard rent ceilings (rent control). Although rent regulations have been dismissed in some policy circles as costly ineffective, they have long been framed as affordability policies and viewed by renters as popular forms of public intervention. Based on our empirical analysis of rent savings and burden reduction for stabilized renters in New York City during the 1990s and 2000s, we argue that rent stabilization should be expanded and paired with policies that increase housing supply to provide a more robust response to the current housing affordability crisis.This research is especially important as the crisis expands and middle-income households become vulnerable populations that need protection against rent inflation. As politicians consider implementing new rent regulations to address growing affordability concerns, we provide evidence that rent stabilization reduces rents and promotes affordability in tight housing markets. Three research questions frame our work. First, who is most likely to benefit from rent stabilization? If higher income and more privileged renters predominately occupy rentstabilized units, that could undermine the ostensive equity objectives of such measures. While we view this critique as a red herring often used to suggest that rent regulation is a "bad" policy, we think it is sociologically important to know if policies thought to alleviate inequality could unintentionally exacerbate it. Second, how much rent, if any at all, do stabilization measures save tenants initially and over time? While it might be obvious that stabilized renters would save on rent compared to their non-stabilized counterparts, previous research suggests that stabilized tenants may pay a premium to gain access to stabilized units that will save them rent in the long run. Finally, doesstabilization reduce the share of rent-burdened households—that is, those spending more than 30 percent of their household income on housing costs? In light of our findings that rent stabilization can save tenants money and reduce rent-to-income ratios, we argue that it is an important policy tool that officials can leverage to address the ongoing affordability crisis.

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