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Describes Population
"it is what it is - live with it"
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Describes
Sample
Precision (1SE)
"How good" your sample is
@ 68% confidence
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Describes
Sample
Precision
(xSE)
"How good" your sample is
@ 'any' confidence |
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Variance (V)
Has no logical meaning.
Used to combine strata and get a combined
SD
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à
divide by n
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Variance of the mean (SE2)
Has no logical meaning.
Used to combine strata and get a combined SE
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↑
square SD to get V |
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↑
square SE to get SE2 |
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Std Deviation
(SD)
Dispersion of individuals about the mean,
given in units
This is the starting place for your
calculations (from your calculator)
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à
divide by
Ön
(sqrt of n)
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Std Error
(SE)
How close the sample mean and the true
mean are likely to be
In units @ 68% confidence |
à
* t
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Sampling Error
(E)
How close the sample mean and the true mean are likely to be
In units @ any confidence (e.g. 95% confidence) |
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¯
divide by mean |
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¯
divide by mean |
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¯
divide by mean |
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Coefficient of Variation (CV)
Basically SD expressed in percent
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à
divide by
Ön
(sqrt of n)
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Std Error in Percent
(SE%)
How close the sample mean and the true
mean are likely to be
In percent @ 68% confidence |
à
* t
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Sampling Error in Percent (E%)
How close the sample mean and the true
mean are likely to be
In
percent @ any confidence
(e.g. 95% confidence)
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