This calculator uses a number of different equations to determine the minimum number of subjects that need to be enrolled in a study in order to have sufficient statistical power to detect a treatment effect. 1. Before a study is conducted, investigators need to determine how many subjects should be included. By enrolling too few subjects, a study may not have enough statistical power to detect a difference (type II error). Enrolling too many patients can be unnecessarily costly or time-consuming.
âBarbara Gordon. Barbara Babs Gordon AKA Batgirl is the daughter of Gotham City's Police Commissioner James Gordon. She later took on the mantle of Batgirl, and became Batman's partner and protegÃ© for many years. Barbara was first seen when her father was shot by Jazzman on the anniversary of the death of Bruce Wayne's parents. A sorrowful Batman visits Gordon in Gotham City Hospital, where Barbara tells him not to blame himself.
Biography: The original Batgirl was created by Bob Kane in 1961. Betty Kane was the niece of Batwoman. Betty Cane was not a popular character during her first appearance in DC Comics. Batgirl became popular when ABC introduced Batman to TV in 1966. In this series, Batgirl was introduced as Barbara Gordon, the niece of Police Commissioner Gordon. In 1967, DC Comics reintroduced Batgirl as the niece of Commissioner Gordon as well.