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.
But when her overprotective Dad forbids her from joining the force, her admiration of Batman leads her to rebel the way crime-fighting rebels do in Gotham City: by picking up the mantle of the Bat. An exceptional fighter and detective, Batgirl is also unparalleled in her computer skills. With a Utility Belt filled with Batarangs and her own Batcycle to speed her across the city, she pursues justice regardless of whether othersâincluding Batmanâwish her to. But Gothamâs criminals are a ruthless and maniacal lot, and every moment she risks her neck means dancing closer to death.