please refer to the "reliability and validity" section contained herein https://en.m.wikipedia.org/wiki/Intelligence_quotient https://en.m.wikipedia.org/wiki/In

please refer to the "reliability and validity" section contained herein https://en.m.wikipedia.org/wiki/Intelligence_quotient https://en.m.wikipedia.org/wiki/Intelligence_quotient It's a much more complicated topic than your comment would suggest. The very definition of "intelligence" in regards to the iq test is fuzzy and ill -defined. Not to mention that Alfie Binet (created the iq test) believed the test itself to be insufficient, and asserted that any true measure of intelligence could not be quantitative.