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.
The Japanese attack on Pearl Harbor in December (7th) of 1941  damaged dozens of ships and sunk quite a few others. The ships sunk  in the attack totaled 18, with 5 battleshâ¦ips included. Perhaps the  most famous victim of the attack was the U.S.S. Arizona, which  continues to serve as a national monument.