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standard
In statistics, the standard deviation (SD, also represented by the lower case Greek letter sigma σ for the population standard deviation or the Latin letter s for the sample standard deviation) is a measure that is used to quantify the amount of variation or dispersion of a set of data values. A low standard deviation indicates that the data points tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the data points are spread out over a wider range of values.
The standard deviation of a random variable, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler, though in practice less robust, than the average absolute deviation.
A useful property of the standard deviation is that, unlike the variance, it is expressed in the same units as the data.
In addition to expressing the variability of a population, the standard deviation is commonly used to measure confidence in statistical conclusions. For example, the margin of error in polling data is determined by calculating the expected standard deviation in the results if the same poll were to be conducted multiple times. This derivation of a standard deviation is often called the "standard error" of the estimate or "standard error of the mean" when referring to a mean. It is computed as the standard deviation of all the means that would be computed from that population if an infinite number of samples were drawn and a mean for each sample were computed.
The standard deviation of a population and the standard error of a statistic derived from that population (such as the mean) are quite different but related (related by the inverse of the square root of the number of observations). The reported margin of error of a poll is computed from the standard error of the mean (or alternatively from the product of the standard deviation of the population and the inverse of the square root of the sample size, which is the same thing) and is typically about twice the standard deviation—the half-width of a 95 percent confidence interval.
In science, many researchers report the standard deviation of experimental data, and only effects that fall much farther than two standard deviations away from what would have been expected are considered statistically significant—normal random error or variation in the measurements is in this way distinguished from likely genuine effects or associations. The standard deviation is also important in finance, where the standard deviation on the rate of return on an investment is a measure of the volatility of the investment.
When only a sample of data from a population is available, the term standard deviation of the sample or sample standard deviation can refer to either the above-mentioned quantity as applied to those data, or to a modified quantity that is an unbiased estimate of the population standard deviation (the standard deviation of the entire population).
Looking for a High Standard Pistol or Parts.
Most interested in a S-100 or S-101 but would consider other models.
Parts too as I need to repair/replace parts on mine.
Thanks!
Suppressed Ruger Standard Model from 1954 100K serial number range. New 4.25" mark IV barrel and suppressor by yours truly. Nice piece. CNC machined clipped interlocking cone baffles. User serviceable. as good as anything on the market. $900 shipped to your dealer in Oregon I suppose. Idaho too...
Brand New Never Shot, BCM 9" .300 Blackout Complete Upper with Surefire Warcomp.
Lower, Hand Stop, Vortex, Bolt, Charging Handle not included in the price but are for sale.
If you have upgraded your Benelli M4 handguards, I'd like to buy the OEM plastic ones you removed.
Not interested in M4 clone parts.
Please PM the price and condition.
Thanks
FOR SALE
Nice old pump gun that appears to have seen little use. Some marks from "closet" storage. 'Gun Safe' was a contradiction in terms when this gun was manufactured. 2-3/4" chamber, solid steel receiver, super smooth action, nice jeweling on the bolt, walnut stock & forend and JC Higgins'...
Standard version, has a few accessories that will not be separated from the rifle.
Synthetic stock which has been painted
Walnut gi stock
SA aluminum scope mount
Has bayonet lug and a bayonet with scabbard
Bipod
+1 5rd mag, +2 10rd mags, +10 20rd mags, +1 50rd drum. (Mix of 9 checkmate and sa...
Never been fired,Added a HuxWrx flash hider and I can throw in ARID’s new brass deflector, There are minor surface scratches on the receiver which you could rattle can it away if it bothers you,Also comes with two 30 round mags.Cash is $1400, Trade value is higher. Beat price you’ll find...
For sale, A High Standard .36 caliber Commemorative revolver. 1776-1976
It is new and comes with a pewter belt buckle, in a leather case. Made in USA by High Standard Firearms.
Asking $785.00
No FFL Needed.
Purchased a few years ago at a gun show, put a box of ammo through it and it has since sat in the safe.
Unfortunately this rifle is import marked and re-parkerized by Blue Sky, which I believe means it came from Korea. That being said, it's manufactured by Standard Products with an Underwood...
3 used M1 carbine mags. Not perfect mags but function well. These are all USGI.
SB=Standard Products shows typical wear from insertion and use, strong feedlips and springs. There is a couple of small areas of surface rust and the front edge of the floorplate is turned up. Engraved...
I recently bought a cheap pre-owned 12ga break open Shotgun from an NWFA member. I have decided to dedicate this shotgun for shooting black powder substitute loads. I will start with using shell loads and may eventually buy one of the 209 chamber adapters that will permit me to muzzle load the...
Price drop through tomorrow (Saturday 7/29)....$750. FIRM, transfer/bcg on buyer, must meet at a FFL IN THE BEAVERTON AREA.
Patriot Ordnance Factory Renegade for sale.
Bought this rifle for my son back in 2018. Has less than 300 rounds through it, and is in excellent condition.
POF Renegade...
Hey all,
Just bought a tikka lite veil and it comes standard with a stainless spiral bolt with a large knob.
I'm not fond of the aesthetic and will trade for a standard t3x bolt.
The bolt assembly is for a 300 wm, so maybe i need to exchange for a mag bolt, I don't know.
Brand new never...
The gun is in perfect working condition, but there is some cosmetic wears that I want to fully disclose. During one day of training, a loosely fit Surefire weaponlight caused wear on the rail area. Other than this, everything else is still in excellent condition. Please refer to the photo for...