Definition: A control variable is a variable that is held constant in a research analysis.The use of control variables is generally done to answer four basic kinds of questions: 1.Is an observed relationship between two variables just a statistical accident? 2.efinition: A control variable is a variable that is held constant in a research analysis.
How Many People Died At Pearl Harbor. Those who have read about American history are acquainted with Japanese attacking the US naval base located at Pearl Harbor on 7th December 1941. The Americans were attacked unaware, without any warning by Japan. This resulted in loss of lives of 2,402 Americans and left around 1282 people injured.
On the 65th anniversary of the Pearl Harbor attacks, they present more parallels, and possibly lessons, for todayâs global war on terror. Within hours of the surprise attack in the early-morning hours of Dec. 7, 1941, more than 2,400 Americans were dead. Five of the eight battleships at the U.S. Fleetâs Pearl Harbor base were sunk or sinking, and the other battleships, as well as ships and Hawaii-based combat planes, were heavily damaged.