In the unselected county children's home population, the C. M. A. standard yielded 20.8% feeble-minded while the Three Per Cent. Hypothesis yielded 5.7%, with most children classified backward¶
Claim · All claims
Evidence · 1 study · associationalr1·q2
Currency · newest study 1917 · not yet checked against its sources · not reviewed by a person · overdue for a recheck since 1920: tool and model accuracy changes quickly
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q2 i? For the 106 children's home children tested with the Yerkes Scale, the C. M. A. standard diagnosed 20.8% feeble-minded whereas the Three Per Cent. Hypothesis diagnosed 5.7%, with 46.2% backward under the latter. → Pintner 1917
Evidence¶
Pintner 1917¶
Pintner, R. (1917). The Mentality of the Dependent Child, Together with a Plan for a Mental Survey of an Institution. The Journal of Educational Psychology. https://doi.org/10.1037/h0075825
q2 · i? · associational · r1
The printed distributions give C. M. A.: 22 feeble-minded (20.8%), 27 backward; Three Per Cent. Hypothesis: 6 feeble-minded (5.7%), 49 backward (46.2%). The writer says the C. M. A. percentage "seems to us unreasonably high."
"The total population of a county children's home was tested with the Yerkes Scale. Here, again, the results are presented as diagnosed by the C. M. A. standard and by the Three Per cent. Hypothesis."
Discussion¶
Related Claims¶
- The Three Per Cent. Hypothesis produced a distribution of children's home cases closer to the normal curve than the C. M. A. method, skewed left with most cases in the backward group — related
- State charity dependent cases contained a much larger percentage of feeble-minded children than the county home cases, 19.5% versus 5.7% by the conservative estimate — related
- If the lowest half of the home children as ranked by class tests had been individually tested, all feeble-minded cases and almost all definitely backward cases would have been detected — related
- About a quarter of eighteen-year-old working children fall below the Yerkes normal-adult range on the Yerkes Point Scale — related
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