Standard deviation from ungrouped data. The standard deviation is a summary measure of the differences of each observation from the mean. If the differences themselves were added up, the positive would exactly balance the negative and so their sum would be zero. Consequently the squares of the differences are added.
A pissant, also seen as piss ant or piss-ant, refers to a specific type of ant. The word is also used as a pejorative noun or adjective, indicating insignificance.he original pissant is any of a certain group of large ant species, commonly called wood ants, that make mounded nests in forests throughout most of Europe.
Ghost ants are members of a tiny invasive species that derives its name from the milky white, almost translucent, color of the ant's legs and abdomens. The color makes them difficult to see.aits are Better. Since ghost ants form several nests, the use of bait tends to be more effective in eradication than insecticide sprays which can kill the ant before it can return to its nest and poison the others. Ghost ants favor sweets so baits with a sugar or honey base work best.