In its first known appearances (in the book Her Royal Highness Woman by Max O'Rell, "The little shepherd of Kingdom Come" by John Fox, and the 1951 play The Moon is Blue by F.
From another point of view, the chart can be interpreted as saying that there should not be an age disparity of as much as five years unless the younger person has an age of 19 or more, a ten-year disparity should exist only if the younger person has an age of 24 or more, and a twenty-year disparity should occur only if the younger person has an age of 34 or more.
(And people only slightly older than 14 should only be involved with those almost exactly the same age as themselves.) To read the chart, go to the position along the x-axis which corresponds to your age, and the green range (between the black and red lines) directly above that position corresponds to the range of your partner's ages which is deemed acceptable by the rule.
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Although there is a not an explicit relationship between the range and standard deviation, there is a rule of thumb that can be useful to relate these two statistics.
This relationship is sometimes referred to as the range rule for standard deviation. This is a very straightforward formula to use, and should only be used as a very rough estimate of the standard deviation.
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This number is relatively close to the true standard deviation, and good for a rough estimate. Recall the properties of the bell curve and the probabilities from a standard normal distribution.
One feature has to do with the amount of data that falls within a certain number of standard deviations: The number that we will use has to do with 95%.
Similarly, in his autobiography, George Arnold Escher (1843-1939, father of famous artist M. Escher) claimed that when he was looking for a wife ca.