作者celestialgod (攸蓝)
看板Statistics
标题Re: [问题] 请问查表问题
时间Mon Nov 25 22:01:46 2013
※ 引述《louis1093 (LouisChi)》之铭言：
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: 想请问
: 1.如果X~F10.12
: (1)P(3.37<X<4.30)=?
Assume P(F > F(10,12,alpha) = alpha
F(10,12,0.025) = 3.37
F(10,12,0.01) = 4.30
P(3.37<X<4.30) = P(X<4.30) - P(X<3.37)
= 0.99 - 0.975
= 0.015
: (2)P(0.344<X<3.37)=?
1/.344 = 2.907 => P(F(10,12) < .344) = P(F(12,10) > 1/.344)=P(F(12,10) > 2.907)
(property of F distribution)
F(12,10,0.05) = 2.907
F(10,12,0.025) = 3.37
P(0.344<X<3.37) = P(X<3.37) - P(X<0.344)
= 0.975 - 0.05
= 0.925
: 2.X~T40
: (1)P(2.021<X<3.551)=?
Assume P(T > t(40, alpha)) = alpha
t(40, 0.025) = 2.021
t(40, 0.0005) = 3.551
P(2.021<X<3.551) = P(X<3.551) - P(X<2.021)
= 0.9995 - 0.9750
= 0.0255
: 以上这两题
: 希望有善心大大能告诉我要怎麽算
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※ 编辑: celestialgod 来自: 36.238.204.122 (11/25 22:02)
1F：→ louis1093:谢谢大大!! 11/26 23:16