n

${\widehat{\eta }}_{\text{mean}}$

${\widehat{\theta }}_{mean}$

$\widehat{\eta }$ 的样本标准差

$\widehat{\theta }$ 的样本标准差

20

0.877

7.464

0.203

9.776

50

0.829

5.555

0.117

1.992

100

0.813

5.276

0.082

1.263

500

0.805

5.049

0.037

0.512