The zero point of the scale is located from the zero-scoring pupils, giving a weighted average distance O-MIII of 1.654 P.E.¶

Claim · All claims
Evidence · 1 study · design r2 · q2
Currency · newest study 1919 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Zero ability was located below the third-grade median using the 50 pupils who scored zero, yielding two measures (1.616 and 1.729 P.E.) whose weighted average is 1.654 P.E., the first measure given double weight. → Herring 1919

Evidence¶

Herring 1919¶

Herring, J. P. (1919). Derivation of a scale to measure abilities in scientific thinking. The Journal of Educational Psychology. https://psycnet.apa.org/journal/edu

q2 · i? · design · r2

Numerical derivation in the section on locating zero: the third-grade median lies 1.616 P.E. above the 50 zero scorers, the fourth-grade median 2.905 P.E., giving a second measure of 1.729 P.E.; the first was double-weighted. No effect size is printed.

"The weighted average distance O-MIII is 1.654 P. E."

Discussion¶

Related Claims¶

• Intermedian grade distances on the scientific-thinking scale are derived from the per cent of each grade's pupils lying between successive grade medians — related
• The P.E. (median deviation) serves as an equal-step unit of difficulty, defined as the distance cutting off 25% of measures next the median — a broader claim this one bears on
• Question E was answered by all 27 high-school pupils, establishing a zero-difficulty reference 2.191 units below the median — related