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Dear Fred,

I agree with all in your last message, with the exception of the last but one 
paragraph, which was the most important, of course. I repeat only this 
passage:

>You appeared to be constructing confidence intervals based upon
the t statistic.  The test statistic in this case would be t =
(deviation from chronometer time) / (standard deviation/square root of
number of observations).

The "(standard deviation/square root of number of observations)" seems to be 
the standard error of the (any) mean. But what is meant by "(deviation from 
chronometer time)"? Is it an error of one observation from six in each subset 
or an average error of a subset (more probably)? And what sense has the whole 
fraction, giving the value "t"? Sorry, I didn't find it in my manuals of 
mathematics during very short searches at the beginning of the New Year in 
Europe.

Thank you for an explanation.


Jan Kalivoda

   

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