Hi Huaru,
Are you sure you are looking at 0.95 and NOT 0.975?

as qt(0.975,9) = 2.262

generally tables are given for alpha/2 (alpha=0.05 in your case)
significance.

Please check carefully.

Thx,
S.

On Sat, Nov 7, 2009 at 4:02 AM, huaru wang <huaru.wang@gmail.com> wrote:

> Hello, every one,
>
> Using the qt() function in R, I got a different Student t-value with the
> Student t table.
> e.g. the return value of function qt(0.95,9) is 1.833, while in table it is
> 2.262.
>
> I do not know why the difference exists.   I guess it may be a bug in R.
> --
> 王化儒 博士研究生
> 北京师范大学景观生态与可持续性科学研究中心
> 北京市海淀区新街口外大街19号北京师范大学生命科学学院 100875
> Huaru Wang
> PhD Candidate, CLESS, College of Life Science, Beijing Normal University
> Tel: 010 - 5880 5812
> Cell phone:189 0137 6067
> No.19 Xinjiekouwai Street, Beijing 1000875
>
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