Re: 請問一題統計題目!!!
看板Statistics作者wbson (Rise of 2nd Empire )時間19年前 (2007/04/17 17:06)推噓0(0推 0噓 0→)留言0則, 0人參與討論串4/4 (看更多)
oops
※ 引述《travelfox (積極)》之銘言：
: ※ 引述《wbson (Rise of 2nd Empire )》之銘言：
The error X_i follows i.i.d Uniform(-0.5, 0.5) i = 1~75
E(X_i) = 0
Var(X_i) = 1/12
E(sum(X_i)) = 0
Var(sum) = 75/12 = 6.25 standard deviation = 2.5
Using normal approximation........
Anyway, the probability of the summation of errors falls
between -5 and 5 (+- 2 standard deviation) is 0.9544
: : 各位大人有錯請指教
: 錯了
: 誤差有正的也有負的
: 應該是 uniform(-0.5,0.5)
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