That is the Barnum effect - https://en.wikipedia.org/wiki/Barnum_effect https://en.wikipedia.org/wiki/Barnum_effect . > In 1948, in what has been described as

That is the Barnum effect - https://en.wikipedia.org/wiki/Barnum_effect https://en.wikipedia.org/wiki/Barnum_effect . > In 1948, in what has been described as a "classic experiment",[10] psychologist Forer gave a psychology test – his so-called "Diagnostic Interest Blank" – to 39 of his psychology students, who were told that they would each receive a brief personality vignette based on their test results. One week later Forer gave each student a purportedly individualized vignette and asked each of them to rate it on how well it applied. In reality, each student received the same vignette, ... On average, the students rated its accuracy as 4.30 on a scale of 0 (very poor) to 5 (excellent). Only after the ratings were turned in, it was revealed that all students had received an identical vignette assembled by Forer from a newsstand astrology book.