A: In a scientific experiment, a confounding variable is a secondary, changing condition that muddies the experimenter's hypothesized inference between cause and effect. Researchers must be meticulous about experiment design to control for confounding variables and to protect the integrity of their findings.
Fairfax County, officially the County of Fairfax, is a county in the Commonwealth of Virginia. As of the 2010 census, the population was 1,081,726, in 2014, the population was estimated to be 1,118,883, making it the most populous jurisdiction in the Commonwealth of Virginia, with 13.6% of Virginia's population.lexandria County was returned to Virginia in 1846, reduced in size by the secession of the independent city of Alexandria in 1870, and renamed Arlington County in 1920. The Fairfax County town of Falls Church became an independent city in 1948.
Fairfax County is home to two historic and beautiful wineries-Paradise Springs Winery and The Winery at Bull Run. Considered by many to be the Gateway to Virginia Wine Country, these wineries are the closest to Washington, DC and are home to a selection of some wonderful, award-winning Virginia wines.ands-on History. Fairfax County played a significant role in some of the most defining moments of American history. On your next vacation, let us be your history travel guide as we put you in perfect position to visit the Washington, DC and Northern Virginia historical sites, attractions, stories, and events.