What about a skewed curve?
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A one third occurance is not normal?
I think Evan is correct.
Ultimately, it's an arbitrary point where "normality" is defined.
Using the method you described, color-blindness qualifies as "normal" since the colorblind population exceeds 5% of the total population. But color-blindness is something most people would consider an abnormality.
But CC said it is defined in stat. Was he trying to hide a value judgement in math?
Total color blindness is not 1/20. Partial (especially minor) color blindness is probably statistically significant (5%) and this normal.Using the method you described, color-blindness qualifies as "normal" since the colorblind population exceeds 5% of the total population. But color-blindness is something most people would consider an abnormality.
Sure it is. If we take one SD, what is the percentage chance of a 'non-normal' occurence? 33%
5% = statistically significant. Look it up. Don't confuse it with p-value.
http://en.wikipedia.org/wiki/Statistical_significanceChoosing level of significance is a somewhat arbitrary task, but for many applications, a level of 5% is chosen, for no better reason than that it is conventional.
See?
Last edited by ecofarm; 12-22-11 at 12:54 PM.
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