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标题: practice exam 1 T29 [打印本页]

作者: fionaqian    时间: 2010-5-31 14:58     标题: practice exam 1 T29

why the answer is A????? anybody can help me??thank you so much!!!

which of the statement about the normal distribution is wrong?
A. has a mean of 0 and standard deviation of 1. (why this is wrong?)
B. is completed described by the mean and the standard deviation
C. is bell-shaped, with tails extending without limit to the left and to the right

[此贴子已经被作者于2010-6-1 7:32:06编辑过]


作者: 水晶蒲桃    时间: 2010-6-4 21:05

我也想知道。。。。


作者: legendz    时间: 2010-6-5 12:00

 必要非充分条件,标准正态分布是服从N(0,1),但是T分布同样可能均值为0,标准差为1。




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