作者wbson (Rise of 2nd Empire )
看板Statistics
标题Re: 请问一题统计题目!!!
时间Tue Apr 17 17:06:43 2007
oops
※ 引述《travelfox (积极)》之铭言：
: ※ 引述《wbson (Rise of 2nd Empire )》之铭言：
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
: : 各位大人有错请指教
: 错了
: 误差有正的也有负的
: 应该是 uniform(-0.5,0.5)
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