Байка, где учителям рандомизированно говорили всякое про способности учеников
"That paper contains some amusing facts about the original Rosenthal and Jacobson study. Some students had pre-test IQ scores near zero, others near 200, yet “the children were neither vegetables nor geniuses.” Exclude scores outside of the range 60 to 160, and the effect disappears. Five of the “bloomers” had increases of over 90 IQ points. Again, exclude these five and the effect disappears. The original study is basically worthless."
https://jasoncollins.blog/2018/05/24/teacher-expectations-and-self-fulfilling-prophesies/