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NMDC

statistical error

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dear all,

Please can anyone explain why the statistical error result from the statistic report is different when i calculate it manually?

e.g this is the result from rockworks report:

Mean .................................... 2.68

Standard Deviation ...................... 2.91
Standard Deviation Error ................ 0.75
when i calculated manually using the formula
SE = StandDev./Sqrt of mean (Where mean is 2.68) =
1.777565
meanwhile in both instances the mean and standard deviation were the same.
Thanks.

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Hi NMDC,

Which menu are you using to calculate statistics?

Send your file [email protected] and we'll attempt to duplicate the problem.

Regards,

Tom B

RockWare Inc

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