数理统计公式 Flashcards

1
Q

P(A—B)

A

P(A)—P(AB)

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2
Q

P(AB逆)

A

P(A)—P(AB)

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3
Q

P(AB)+P(AB逆)

A

P(A)

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4
Q

P(A1A2|B)

A

P(A1|B)P(A2|A1B)

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5
Q

分布函数的概念和性质

A
概念:书70页
分布函数的性质
(1)非负有界性 0≤F(X)≤1
(2)单调不减性
证明:即对任意的X1=0,即
P{x1=0。从而证明F(x1)<=F(x2)
(3)右连续性 F(x+0)=F(x)
(4)趋于负无穷时=0 趋于正无穷时=1
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6
Q

P(A并B)

A

P(A)+P(B)—P(AB)

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7
Q

德摩根定律:

A

非(P 且 Q) = (非 P) 或 (非 Q)

非(P 或 Q) = (非 P) 且 (非 Q)

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8
Q

全概率公式

A

P(A)=∑i=1,n P(A|Bi)P(Bi),BiBj=空集,i不等于j,所有的Bi相加为全集。

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9
Q

乘法公式

A

P(A1A2)=P(A1)P(A2|A1)

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10
Q

Bayes公式

A

P(Bj|A)=P(A|Bj)P(Bj)/∑i=1,n P(A|Bi)P(Bi),j=1.2.3…,n

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11
Q

独立重复实验:将某实验重复n次,如果每次实验中A发生的概率是P,则n次实验中A发生K次的概率为

A

P(X=K)=Cn k Pk(1-p)n—k

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12
Q

泊松分布与泊松定律

A

复制题目到网上找答案吧

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13
Q

几何分布

A

G(p)照片墙上去找

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14
Q

超几何分布

A

X~H(N,M,n)照片墙上去找

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15
Q

均匀分布

A

X~U(a,b)照片墙上。

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16
Q

指数分布

A

X~E(λ)

17
Q

正态分布

A

X~N(μ,σ²)