Stanine (STAndard NINE) is a method of scaling test scores on a nine-point standard scale with a mean of five and a standard deviation of two. Some web sources attribute stanines to the U.S. Army Air Forces during World War II. Psychometric legend has it that a 1–9 scale was used because of the compactness of recording the score as a single digit but Thorndike claims that by reducing scores to just nine values, stanines "reduce the tendency to try to interpret small score differences (p. 131)". The earliest known use of stanines was by the U.S. Army Air Forces in 1943. (Wikipedia).
What is the difference between convex and concave
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
At just the age of 20, Walt Haaser was in charge of a B-17 bomber crew of ten men. In April, 1945, he and his crew would make a desperate escape in their stricken bomber. Special thanks to Fred Haaser This is original content based on research by The History Guy. Images in the Public D
From playlist Aviation
Biology Quiz: What are organelles?
Ready to make the grade in biology? Subscribe to our new Biology channel to get more quizzes and biology animations! https://bit.ly/3jHu5UP #biology #DNA #shorts
From playlist 1 Minute Biology Quizzes
Preliminary Chemistry Water Water as a Solvent, Polarity
From playlist Preliminary Chemistry - Water
Iodine (version 1) - Periodic Table of Videos
Iodine is a solid which turns to a purple vapour when heated. It is number 53 on the periodic table. More links in description below ↓↓↓ Support Periodic Videos on Patreon: https://www.patreon.com/periodicvideos A video on every element: http://bit.ly/118elements More at http://www.per
From playlist With Portuguese subtitles (Português) - Periodic Videos
Astatine (version 1) - Periodic Table of Videos
NEWER ASTATINE VIDEO: https://youtu.be/GP8jJgzEmwE Because of its radioactivity and short half life, Astatine is an element few chemists come into contact with. More links in description below ↓↓↓ Support Periodic Videos on Patreon: https://www.patreon.com/periodicvideos A video on every
From playlist With Portuguese subtitles (Português) - Periodic Videos
Lanthanum - Periodic Table of Videos
Lanthanum is the first of the rare earth minerals. Hear a mnemonics used by chemists to remember the order of the lanthanide series. More links in description below ↓↓↓ Support Periodic Videos on Patreon: https://www.patreon.com/periodicvideos A video on every element: http://bit.ly/118e
From playlist With Portuguese subtitles (Português) - Periodic Videos
What is the difference between convex and concave polygons
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which at least one of its interior angles is greater than 1
From playlist Classify Polygons
Cytoplasm || Class 9 Science || Infinity Learn Class 9&10
Cytoplasm is a gel-like substance that fills the cell membrane of all living cells. It is a complex mixture of water, salts, proteins, lipids, and other molecules that perform various functions in the cell. The cytoplasm serves as a medium for the movement of organelles and other molecule
From playlist Class 9 || Infinity Learn Class 9&10
Ilya Molchanov: Set-valued risk measures of non-convex portfolios
Abstract: Non-convex random sets of admissible positions naturally arise in the setting of fixed transaction costs or when only a finite range of possible transactions is considered. The talk defines set-valued risk measures in such cases and explores the situations when they return convex
From playlist Probability and Statistics