https://www.khanacademy.org/math/ap-statistics/tests-significance-ap/error-probabilities-power/v/introduction-to-type-i-and-type-ii-errors
https://www.google.com/search?q=%CE%B2+error&rlz=1C1CHBF_enBD864BD864&oq=%CE%B2+error&aqs=chrome..69i57j0l7.10568j0j8&sourceid=chrome&ie=UTF-8
