(四)若在進行抽樣調查之前，賣場經理決定使用樣本平均數（sample mean）做為所有顧客平均消費金額的點估計，且已知其賣場顧客消費金額的（母體）標準差為 625 元，在此情形下，其顧客消費金額的抽樣數目應至少設定為多少，才能有 95%的機率使估計誤差可以控制在 50 元以內？（10 分）

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三、某賣場經理為研究其顧客之入場消費情況，他隨機抽取了 400 個顧客的消費紀錄，發現這 400 個顧客的平均消費金額為新臺幣（下同）2150 元，並且已知其賣場顧客消費金額的（母體）標準差為 625 元，且其顧客的消費金額呈常態分布。

詳解 (共 1 筆)

漁火夜

詳解 #7045488

2025/11/07

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幫按讚

私人筆記 #6916208

2025/04/27

非選9. 【題組】 ...

(共 230 字，隱藏中）

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一、英譯中：請將下列文章翻譯成中文。 The European Commission is taking action to tackle risks stemming from low- value imports sold via non-EU online retailers and marketplaces hosting non- EU traders. The Commission encourages actions, among others, in the areas of customs and trade, such as launching customs controls, consumer protection and the Digital Services and Digital Markets Acts. Last year, around 4.6 billion low-value consignments, i.e., goods with a value not exceeding €150, entered the EU market equaling to 12 million parcels per day. This is twice as many as in 2023 and three times as many as in 2022, and many of these goods have found to be non-compliant with European legislation. This exponential growth is raising numerous concerns. Mainly, there are more and more harmful products entering the EU. More so, European sellers, who respect our high product standards, are at risk of being harmed by unfair practices and the sale of counterfeit goods through online marketplaces. Finally, the large number of packages being shipped and transported has a negative environmental and climate footprint.

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