A
Anonymous
For ya'll out there into statistics (a long 4-letter word, I know):
Given a statistically valid sample (usually not less than N = 120), collected at random for a given breed, trait, or whatever, according to the probability curve:
About 67% of individuals will fall within +/- 1 standard deviation of the mean for any sampled item. Two standard deviations will include about 95% of the sampled population; and 3 standard deviations will include about 98% of the population.
So, for a hypothetical pure sample of anything, if the Mean (average) of something is 100, then +/- one standard deviation approximately 67% of the "anything" would fall between a value of 85 and 115. Again, the assumption is (on a pure sample) that a standard deviation is about 1/6 of the range...in a theoretical perfect distribution of cases, scores, items, measurements, or whatever.
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Given a statistically valid sample (usually not less than N = 120), collected at random for a given breed, trait, or whatever, according to the probability curve:
About 67% of individuals will fall within +/- 1 standard deviation of the mean for any sampled item. Two standard deviations will include about 95% of the sampled population; and 3 standard deviations will include about 98% of the population.
So, for a hypothetical pure sample of anything, if the Mean (average) of something is 100, then +/- one standard deviation approximately 67% of the "anything" would fall between a value of 85 and 115. Again, the assumption is (on a pure sample) that a standard deviation is about 1/6 of the range...in a theoretical perfect distribution of cases, scores, items, measurements, or whatever.
[email protected]