B事件應(yīng)該是diagnose disease不是diagnose，因?yàn)檫€有diagnose no disease
為何X和X的協(xié)方差等于方差，方差的分母是n,協(xié)方差的分母是n-1，應(yīng)該怎么理解呀
您好，這道題還有什么解答辦法，解析里面的有點(diǎn)難，看不太懂，我是把每個(gè)數(shù)值帶進(jìn)去計(jì)算的，這樣又有點(diǎn)耽擱時(shí)間。
老師，請(qǐng)問隨著n逐漸變大時(shí)，特別是接近于總體時(shí)，那這個(gè)樣本的方差不是更接近于總體方差嗎？可是按照這個(gè)公式樣本方差=總體方差/n,n變大，樣本方差則變小了，離總體方差越來越遠(yuǎn)了
為啥夏普比例越高，說明離散程度越??？
您好，這道題的第二部解答里面，我不明白，為什么是N=-4，不是-5.因?yàn)椴皇钦f5個(gè)季度后才支付嗎？The value today is (where FV is future value)PV = FVN(1 + r)–NPV = $133.33(1 + 0.015)–4PV = $125.62 ≈ $126.
調(diào)和平均數(shù)易受異常值的影響，且受極小值的影響比受極大值的影響更大，老師講的不對(duì)??！
老師，用每一筆現(xiàn)金流加總的辦法時(shí)，每一段的PMT是多少呢
老師，題目沒有說存到18期就不存了，這里在支付學(xué)費(fèi)的4年中，每年也會(huì)定期再存錢，為什么計(jì)算時(shí)不考慮這一點(diǎn)呢？
Q. Given a stated annual interest rate of 6% compounded quarterly, the level amount that, deposited quarterly, will grow to ￡25,000 at the end of 10 years is closest to: ￡461. ￡474. ￡836.這道題怎么算，我用金融計(jì)算器算出來，沒有選項(xiàng)里的答案，老師可以幫忙按計(jì)算器算算嗎？
Q. A sports car, purchased for ￡200,000, is financed for five years at an annual rate of 6% compounded monthly. If the first payment is due in one month, the monthly payment is closest to: ￡3,847. ￡3,867. ￡3,957.這道題的正確答案是b，我怎么算出來的答案不對(duì)，老師能講解一下，我用計(jì)算器算的，不知道哪個(gè)數(shù)值按錯(cuò)了。
老師，lnX~N,則X~lognormal,那這里沒有說反嗎
這道題，只要會(huì)用計(jì)算器計(jì)算就可以，還是必須得掌握公式。我看cfa協(xié)會(huì)的題庫里面全是這樣解答的。
這道題，Q. An investment pays €300 annually for five years, with the first payment occurring today. The present value (PV) of the investment discounted at a 4% annual rate is closest to: €1,336. €1,389. €1,625. 只要會(huì)用金融計(jì)算器會(huì)算就可以了，還是必須得掌握公式B is correct, as shown in the following calculation for an annuity (A) due: PV=A[1?1(1+r)Nr](1+r), where A = €300, r = 0.04, and N = 5. PV=€300[1?1(1+.04)5.04](1.04) PV = €1,388.97, or ≈ €1,389.
老師您好：請(qǐng)看圖片，謝謝
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