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Sex Differences in Height and Weight

The National Center for Health Statistics provides the following data regarding the average height and weight of American 20 year old boys and girls. 

It shows that the average 20 year old boy  is 8.4% taller than the average girl, 69.8 inches versus 64.2 inches. 94% of 20 year old boys are within plus or minus 7.5%, and 98% are within plus or minus 8.2%, of 69.8 inches tall, whereas 94% of girls are within plus or minus 7.5%, and 98% are within plus or minus 8.2% of, 64.2 inches tall.  What is more important to understand about the distribution of this data is that more than half of the boys are taller than 98% of the girls, and more than half of girls are shorter than 98% of the boys.  The overlap for each group (the percent of boys who are shorter than some of the tallest girls, and the percent of girls who are taller than some of the shorter boys) is less than 10%.  Because of the symmetry of the curves for height, the gap at the higher ends of the curves is almost identical to the gap in the average height, which is similar to the curves for most standardized test scores.

 

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It is the same pattern which is observed on almost every standardized test ever developed, with the overlap in math being even smaller than ten percent, but with the overlap in language being closer to the following chart for the weight of twenty year olds in pounds.  The important point here is that, for example, demanding that there be an equal number of women engineers as men engineers in an organization, as affirmative action programs do, guarantees that many unqualified women employees will displace many more highly qualified men engineers.

 

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http://www.cdc.gov/nchs/data/ad314.pdf

Percentile

3

5

10

25

50

25

10

5

3

Weight

Boys

119

122

129

140

156

174

196

211

222

Girls

100

102

107

116

128

146

166

183

196

Height

Boys

64.5

65

66

67.8

69.6

71.5

73.2

74.1

74.9

Girls

59.5

60

61

62.7

64.3

66

67.6

68.5

69

Notice how similar the bell curves for the height of boys and girls are to the bell curves of Graduate Record Exam scores for Social Work majors (who are mostly girls) and for Math Majors (who are mostly boys), and how different they are from the feminist view of the world as expressed by Judith Kleinfeld.  Judith acknowledges the wider spread in the distribution of boys' scores, but by ignoring that there is more than a standard deviation difference between the average scores of boys and girls, she misleads girls and does a serious disservice to boys.

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Even among education majors, where the lowest scoring boys are compared to the highest scoring girls, there is still a 40 GRE point difference.

Why do feminists have such an erroneous view of the world?  Do they not understand the data?  Do they not want to believe it?  Or do they understand and believe it, but just plain flat out LIE to prevent their warped view of the world from being challenged?  Either way, this is a graphic example of the difference between the way the female and male brains work.