Hasil (
Bahasa Indonesia) 1:
[Salinan]Disalin!
T.L. Kelley (1939) demonstrated empirically that when the response of the individuals in the upper 27 per cent was compared with the response of the in dividuals in the lower 27 per cent, the ratio of the difference between the means of the two groups over a probable error of the difference between the means was maximum.
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