Re: [問題] 請問查表問題

[celestialgod (攸藍)]

※ 引述《louis1093 (LouisChi)》之銘言：
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: 想請問
: 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

: 以上這兩題
: 希望有善心大大能告訴我要怎麼算

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※ 編輯: celestialgod    來自: 36.238.204.122       (11/25 22:02)
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