FOOTNOTES:
[9] See footnote on p. 42 for an explanation of the computation and meaning of such measures of deviation or error.
[10] Experimental Studies in Judgment, Archives of Psychology, No. 29, 1913, 119 pp.
[11] "American Men of Science." Second edition, p. 542.
[12] See p. 45 for explanation of the meaning and technique of correlation.