[24] For an extensive summary of other data on the variability of the sexes see the article by Leta S. Hollingworth, in The American Journal of Sociology (January, 1914), pp. 510–30. It is shown that the findings of others support the conclusions set forth above.
[25] The results of this comparison have been set forth in detail in the monograph of source material and some of the conclusions have been set forth on p. [115] ff. of the present volume.
[27] See [Chapter VI] for further discussion of the school progress possible to children of various I Q’s.
CHAPTER VI
THE SIGNIFICANCE OF VARIOUS INTELLIGENCE QUOTIENTS
Frequency of different degrees of intelligence.
Before we can interpret the results of an examination it is necessary to know how frequently an I Q of the size found occurs among unselected children. Our tests of 1000 unselected children enable us to answer this question with some degree of definiteness. A study of these 1000 I Q’s shows the following significant facts:—
| The lowest | 1% | go to | 70 | or below, the highest | 1% | reach | 130 | or above |
| " " | 2% | "" | 73 | " " " " | 2% | " | 128 | " " |
| " " | 3% | "" | 76 | " " " " | 3% | " | 125 | " " |
| " " | 5% | "" | 78 | " " " " | 5% | " | 122 | " " |
| " " | 10% | "" | 85 | " " " " | 10% | " | 116 | " " |
| " " | 15% | "" | 88 | " " " " | 15% | " | 113 | " " |
| " " | 20% | "" | 91 | " " " " | 20% | " | 110 | " " |
| " " | 25% | "" | 92 | " " " " | 25% | " | 108 | " " |
| " " | 33⅓% | "" | 95 | " " " " | 33⅓% | " | 106 | " " |
Or, to put some of the above facts in another form:—