Electrical Code or Electrical Contractor: EF: Exhaust Fan: ELEV: Elevator: EM: Emergency: EMT: Electrical Metallic Tubing: EP: Emergency Power: EPO: Emergency Power Off (Button or Switch) EWC: Electric Water Cooler: F: Fuse: FA: Fire Alarm: FAA: Fire Alarm Annunciator: FLA: Full Load Amperes: FMC: Flexible Metal Conduit: G: Ground: GFCI, GFI: Ground Fault Circuit Interrupter: GND: Ground: GRMC
The hypergeometric distribution is used for sampling without replacement. The density of this distribution with parameters m, n and k (named Np, N-Np, and n, respectively in the reference below) is given by. p(x) = choose(m, x) choose(n, k-x) / choose(m+n, k) for x = 0, â¦, k.
Multistage sampling used frequently when a complete list of all members of the population not exists and is inappropriate. Moreover, by avoiding the use of all sample units in all selected clusters, multistage sampling avoids the large, and perhaps unnecessary, costs associated with traditional cluster sampling.