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# Stats help watch

1. Basically my problem is do I know the standard deviation or not.

The question is about voting patterns with a set of data we have been given Conservative =2 and Other =1 sample size of 765.

The test is whether mean=0.5=m

One way I have found is to use

Sample mean-m/sqrt(m(1-m)/n)

however another I get is to calculate the standard deviation from the data and plug that in ie

sample mean- m/standard deviation/n

Which method should I use and why?

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Updated: April 15, 2011
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