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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).
Nothing special or strange, just a standard p320 FCU. Was going to build out a fancy gun but lost steam and decided to get more CZ stuff. Originally pulled from a p320 compact, only a few hundred rounds through it.
Put this one together this morning . 1947 production H-D Military Hi Standard with new production stainless steel internal clipped indexed baffle suppressor and chromoly tube and end caps . DARK black Parkerizing with original black bakelite grips. Pistol has been completely gone through and...
Original owner, only used once at range with about 10 rounds. This is a piece of art. Plenty of reviews online. 2 Mags, original case. Buyer pays FFL. I prefer the FFL "A Cut Above Pawn" (18335 SW Tualatin Valley Hwy, Beaverton, OR 97003) or "Wooster Armory" (9587 SW Cascade Ave, Beaverton...
This is the first one I'll put up. This one is a 1949 vintage H-D Military converted to HDM/s status . I build these all the time and this one came from a gun that while it had some finish issues was as mechanically perfect as they come. Turned out very nice. New Ruger Mark 4 barrel , new...
Link to product: https://bravocompanyusa.com/bcm--mk2-standard-14.5--mid-length-upper-receiver-group-w/-qrf-12-handguard---fde/
Around 200 rounds through this upper - including the SLR Solo 13.5'' handguard that is installed as well as the original QRF quad rail that comes with the upper...
This 1954 Ruger Standard (.22 LR semi-automatic pistol) is in remarkably good condition. It does have some wear on the blue and grips from living on a hip, but the action is tight and the rifling is like-new. Features a 4.75" barrel and an original leather holster.
Not much to say here as well hasn’t seen much use at all and it would be better used by someone else. Easily converts your Glock 27 to a caliber that’s a little bit cheaper to train with and easier to find in the current world. Paid $129 for it so $75 seems fair to me.
Mostly looking for cash...
I have a really cool, Ruger Standard from '58. The pistol is in original condition and shows wear but no rust or signs of abuse. Comes with original period correct mag and new production Ruger mag.
Went full retro on this one. Clone of a WW2 British MI6 contract lend lease suppressed Hi Standard model B. Saw one like it in the Imperial War Museum. In a Warshal #46 holster .
I have a good shooting Ruger Standard that I believe was made in ‘58. Bluing is worn in normal spots, mostly the back strap. Comes with original mag and one new production Ruger mag.
$400
Not looking for trades unless they are in my favor.
As much as I hate to, ive gotta sell this. Chambered in .22lr. Manufactured approximately 1981. Lightly used, includes 2 mags original box and papers within. I havent fired it much. Maybe 2-3 mags. Just sits. Willing to ship or meet FTF. Asking $450 + shipping OBO. Also interested in milsurps...