Median Alpha scores increase each year of high school, by about 15, 10 and 4 points across the successive year intervals¶

Claim · All claims
Evidence · 1 study · associational r1 · q2
Currency · newest study 1922 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q2 i? Average median Alpha scores rise about 15 points from freshman to sophomore year, 10 points from sophomore to junior, and 4 points from junior to senior year, with a total freshman-to-senior increase of about 30 points. → Cobb 1922

Evidence¶

Cobb 1922¶

Cobb, Margaret V. (1922). The Limits Set to Educational Achievement by Limited Intelligence. The Journal of Educational Psychology, Vol. XIII, No. 8. https://eric.ed.gov/?q=The+Limits+Set+to+Educational+Achievement+by+Limited+Intelligence

q2 · i? · associational · r1

Section III reports yearly increases in Alpha medians across surveyed schools (Tables X and XI). The article attributes the gains jointly to mental growth, temporary effects of instruction, and educational selection, and cannot apportion them exactly: "the exact amount which is due to this cause is at present impossible" to determine.

"The average figures from Table X are, from freshman to sophomore year, 15 points; from sophomore to junior year, 10 points; and from junior to senior year, 4 points."

Discussion¶

Related Claims¶

• Correlations between Alpha and grades vary by class standing, lowest for graduates (r = .15) and highest for seniors (r = .38) — related
• Preferred instruction type shifted by year: Prep School, freshman and sophomore students preferred implicit instruction while junior and senior students preferred meaning-focused instruction — related