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.
Here are some quick descriptions of the four species: 1  Pavement ant: 1/8-inch long, reddish brown, head has grooves and is equal to or slightly larger than abdomen, two nodes*. 2  Slow moving, and will often dump out little sand piles where nesting.3  Odorous House ant: 1/8-inch long, dark brown to black, single node*.ere are some quick descriptions of the four species: 1  Pavement ant: 1/8-inch long, reddish brown, head has grooves and is equal to or slightly larger than abdomen, two nodes*. 2  Slow moving, and will often dump out little sand piles where nesting.