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Published online by Cambridge University Press: 01 January 2025
* Horst, A. P. The difficulty of a multiple-choice test item. J. educ. Psychol., 24, 229-232.
† Vid., Kelley, T. L. Fundamentals of statistics. Cambridge: Harvard Univ. Press, 1947. Pp. 242-243.
* David, T. N., Tables of the ordinates and probability integral of the distribution of r in small samples. Cambridge: Cambridge University Press, 1938.
** AAF Aviation Psychology Program Research Reports, No. 18, Washington: Government Printing Office, 1947.