|
- UID
- 223277
- 帖子
- 269
- 主题
- 140
- 注册时间
- 2011-7-11
- 最后登录
- 2013-10-9
|
SeeEfAye Wrote:
-------------------------------------------------------
> The null always has the 'equals to" sign. For this
> question the null would be that the mean return is
> less than or equal to the return on other days,
> which is another way of saying 'not greater than'
+1 .. totally correct |
|
发表于 2011-7-11 18:34
|