Question difficulty was scored as percentage of correctness, assumed inversely related to difficulty¶

Claim · All claims
Evidence · 1 study · design r2 · q2
Currency · newest study 1922 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? The scaling method assumes the percentage of pupils answering a question correctly is in inverse ratio to its difficulty, which the author says practically measures the inefficiency of present school methods. → Sackett 1922

Evidence¶

Sackett 1922¶

Sackett, L. W. (1922). A Scale in Ancient History. The Journal of Educational Psychology. https://psycnet.apa.org/journals/edu

q2 · i? · design · r2

Methodological statement from the article's calculation section, describing the assumption underlying the scaling rather than a tested result. The author concedes the assumption "may not really be true in either case, but practically it is true" for present purposes.

"The percentage of correctness in answering a question is assumed to be in inverse ratio to its difficulty, just as the percentage of those who spell a word is an inverse measure of its difficulty. This may not really be true in either case, but practically it is true"

Discussion¶

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