[R] Help with significance. T-test?

[Ben Bolker]

mik07 wrote:
> 
> Hi,
> 
> this is more a general statistics question I think.
> 
> I am working on a system which automatically answers user questions (such
> systems are commonly called "Question Answering systems").
> I evaluated different versions of the same system on a publicly available
> test set.
> This set contains 500 question. Naturally, for each question the answer
> can be wrong or right, which is coded as "0" (wrong) or "1" (correct). By
> adding up all values, and dividing them by the number of questions in the
> test set (that's 500), one gets a measure for how well the system
> performs, commonly called accuracy.
> As mentioned I evaluated two different versions of the system, and
> received two different accuracy values. Now I want to know whether the
> difference is statistically significant. 
> 

?prop.test

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