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Standard Error

The Standard Error is the the standard deviation of the mean of a sample. If you:

• take a large number of samples, of equal size, from a population
• calculate the mean of each sample
• calculate the standard deviation of the sample means

you will have found the standard error. The standard error is related to the population (process) standard deviation by: where 'n' is the sample size.

The standard error is less than the population standard deviation because taking the mean of a sample has an 'averaging' effect; the larger and smaller values in the sample tend to average out. Analytical and descriptive statistics are covered in the MiC Quality online course Primer in Statistics. Try out our courses by taking the first module of the Primer in Statistics free of charge. [SIX SIGMA GLOSSARY ALPHABETICAL INDEX] [SIX SIGMA GLOSSARY INDEX OF TOPICS] [Top]

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 :: Six Sigma Primer :: Primer in Statistics :: Advanced Statistics :: Statistical Process Control SPC :: Advanced SPC :: Design of Experiments :: Advanced DOE :: Measurement Systems Analysis MSA/ Gage R&R Primer in Statistics FREE First Module "Introduction to Statistics" Primer in Statistics FREE Reference Booklet FREE Excel Primer 