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andrewcan发表于 2002-10-29 04:49 | 只看该作者

a PS question, please instruct how to solve it

The standard deviation of a certain set of data is 4. If 12 is 1.5 standard deviations away from the mean, which of the following values could be the mean of the set of data?

A. 6
B. 16
C. 8
D. 14
E. 10
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spry发表于 2002-10-29 07:09 | 只看该作者
sd=4
|12-mean|=1.5*sd=1.5*4=6 =>mean=6 or 18.




[此贴子已经被spry于2002-10-29 7:09:38编辑过]

\"Our lives are a combination of good and bad, positive and negative.When we focus on the good that is already present, we feel better. If not, we don\'t. Either way, life goes on.\" -- Peter McWilliams

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andrewcan发表于 2002-10-29 08:38 | 只看该作者
Thanks!  It definately seems simple to you!
BTW, the quotation is impressive!

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spry发表于 2002-10-29 09:13 | 只看该作者
hehe, thanks, and you are welcome.
\"Our lives are a combination of good and bad, positive and negative.When we focus on the good that is already present, we feel better. If not, we don\'t. Either way, life goes on.\" -- Peter McWilliams

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