Half-year standards were set so the median child of each age had an IQ within 0.90 to 1.10 in every community, and discrepancies were small¶

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? Under the new standards, the median child in each community stayed within the normal IQ group (0.90 to 1.10); the largest deviation occurred in the twelfth year, where the lowest-scoring group's median child had an IQ of 0.93 and the highest-scoring group's had 1.04. → Walter F. Dearborn and Edward A. Lincoln 1922

Evidence¶

Walter F. Dearborn and Edward A. Lincoln 1922¶

Walter F. Dearborn and Edward A. Lincoln. (1922). How the Dearborn Intelligence Examination Standards Were Obtained. The Journal of Educational Psychology. https://doi.org/10.1037/h0075378

q2 · i? · associational · r1

Analysis of the plotted standards diagram for Series II examinations given in grades two through senior high school in three towns. The article reports this as the greatest discrepancy: median IQs of 0.93 and 1.04 in the twelfth year, with smaller deviations elsewhere.

"the median child in the lowest scoring group has an IQ of 0.93, and the median child in the highest scoring group has 1.04 for an IQ. The other deviations from 1.00 are much smaller."

Discussion¶

Related Claims¶

• The assumption that children of a given age have a median age exactly at the half year was found incorrect in the standardization sample — related
• IQ scores tend to run low in communities where adults are engaged mostly in unskilled or semi-skilled labor, and apparent age- or grade-level anomalies usually have an explainable cause — related