The t test is a two-tailed test because the tail of the distribution on each side of the mean is analyzed. For many laboratory measurements or clinical trials, one would want a two tailed test because the value or the outcome could be either above or below the mean.
Al Gore, in full Albert Arnold Gore, Jr. (born March 31, 1948, Washington, D.C., U.S.), 45th vice president of the United States (1993â2001) in the Democratic administration of President Bill Clinton.
Al Gore and his then-wife, Tipper, arriving at the Academy Awards in Hollywood, Calif., in 2007. An Inconvenient Truth, featuring Mr. Gore, won an Oscar for best documentary. Credit Timothy A. Clary/Agence France-Presse â Getty Images.