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規 範 化 樣 本 平 均<br />

規 範 化 樣 本 平 均 Z n 的 期 望 值 為<br />

[ ]<br />

Sn − nµ<br />

E[Z n ] = E<br />

σ √ = E[S n − nµ]<br />

n σ √ n<br />

= 0.<br />

= E[S n] − nµ<br />

σ √ n<br />

變 異 數 為<br />

( )<br />

Sn − nµ<br />

var(Z n ) = var<br />

σ √ n<br />

= 1.<br />

= var(S n − nµ)<br />

σ 2 n<br />

= var(S n)<br />

σ 2 n<br />

= σ2 n<br />

σ 2 n<br />

Chia-Ping Chen ( 中 山 資 工 ) Limit Theorems 機 率 學 講 義 11 / 28

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