The direction of a correlation is either positive or negative. In a negative correlation, the variables move in inverse, or opposite, directions. In other words, as one variable increases, the other variable decreases. For example, there is a negative correlation between self-esteem and depression. In other words, the higher your self-esteem, the lower your feelings of depression.
Excel Communications was founded in 1988 by Dallas entrepreneur Kenny Troutt as a long distance reseller in the US telecom sector at the birth of telecom deregulation.
For more on the history of Microsoft, read on. Microsoft was founded by Bill Gates and Paul Allen on April 4, 1975. It is a multinational computer technology corporation of America that dominates the world of computing. Microsoft is a prominent name in the field of home computer operating systems with MS-DOS and Windows being their most popular products.