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education/statistics/Sampling.md
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@ -72,7 +72,9 @@ Remember that the *parameter* is the *number* that actually describes the popula
For any unknown average, the probability histogram of the sample averages will be shaped like the normal curve and centered at the true average with a standard deviation equal to $SE_{ave}$. For any unknown average, the probability histogram of the sample averages will be shaped like the normal curve and centered at the true average with a standard deviation equal to $SE_{ave}$.
$$ sample_{ave} \pm 2 * se_{ave} $$ $$ sample_{ave} \pm 2 * SE_{ave} $$
This equation should be a review:
$$ SE_{ave} = \frac{SD}{\sqrt{size\space samp}} $$
The above equation will give you an interval that you can be 95% confident that the true random will be within that point. The above equation will give you an interval that you can be 95% confident that the true random will be within that point.
95% does *not* mean that 95% of the data is in the interval, it just means we are 95% confident that the actual point is going to lie within the range specified. 95% does *not* mean that 95% of the data is in the interval, it just means we are 95% confident that the actual point is going to lie within the range specified.