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94年 - 94 淡江大學 轉學考 機率與統計學#56045
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4. Let X be a normal random variable with mean " and variance σ
2
. Compute the moment generating function E[e
tx
] and then compute E(X
3
)
其他申論題
(b) Describe the Chi-Squared Goodness-of-fit Test. (8%)
#212656
1.請舉例說明何爲中央極限定理(central limit theorem)以及大數法則(law of large nuinljers).
#212657
2.有A,B,C,D,E共5個人,A君欲將一個紙條傳送給E君,A君在紙條上可能作的記號爲“+”或是“-”符號,而這個 紙條將透過A傳給B, B傳給C, C傳給D而最後D再傳給E,從過去經驗知道A君在紙條上作“+”的機率爲而 B, C, D三人接到紙條後可能會更改符號的機率皆爲現在E君發現手上的紙條符號是“十”,請問在此條件下A君當 初作的記號是“十”的機率爲多少?.
#212658
3. Lei A, and Y be two iadependent, Possioa random variables with mean λ1 arid λ2. Find the conditional probability P(X = x | X+ Y = k), where x = 0,1, ..., k.
#212659
(i) Show that and X1X2X3 has the same distribution where X1,X2 and X3 are i.i.d. U(0,1) r.v,s.
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【已刪除】(ii) Let Z be the number of , , where 0 < t < 1, show that Z lias a Poission distribution with parameter -log/.. (Hint: you can use the fact that which is the exponential dist. with mean 2)
#212662
【已刪除】(i) Prove that
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【已刪除】(ii) Show that are unbiased estimators of β and α
#212664
(i)本題的型一錯誤及型二錯誤分別爲何?
#212665
(ii)在顯著水準爲0.05的情形下,根據資料你將如何建議縣長.
#212666