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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).
I have a nice set of black rubber GRIPS with brass inserts for a high standard model b 22. $30 shipping is available on your dime.
Best to text 541-974-4569
Breakdown:
6 Box of CCi Standard Velocity 22LR 40 Grain - (600 Rounds)
2 Box of CCi 22 Long 22LR 29 Grain - (200 Rounds)
1 Box of Remington Golden Bullet 22LR - (100 Rounds)
Total = 900 Rounds
I bought it new last summer 2023 amd never use it. An extra ones that's not needed. I'm in Newberg, OR...
This is not a firearm. BNIB Gen 2, Glock 9/40 with the good brace. Meet ftf in public area. Direct swap cash for toy. You will need to do your sizing/fitting afterwards.
Thank you for your understanding.
10 boxes of 50 rounds each of CCI STANDARD VELOCITY 1070 FPS 40 grain. Total of 500 rounds
subsonic? is 1070 subsonic?
first $50 cash takes them home. Cabelas has 100 rounds for $12 per/ 100
buyer must meet up in the Wilsonville area
Thanks for looking
more 22LR to post soon!
I purchased this new directly from Sig. Like New/Hardly used. It's the exact one I use in the Army.
I can Ship if needed, buyer pays shipping.
Details
https://safariland.com/products/mhhc-military-kit/
From Sig:
M17 MILITARY HOLSTER
SKU: HOL-SAF-M17-MHHCKIT-TAN-RH
I'm in a pinch and need to...
Location: Limitless America (Washougal, WA) or Advanced Firearms Training (Gresham, OR), are my preferred but we can discuss other venues as they are my most convenient.
Price: $320 + Background/transfer fees. No trades
I bought a Beretta 92FSR .22lr years ago. And due to working multiple jobs...
I have an old Sentinel with 6" barrel that is one of the most accurate handguns i have shot. Single/Double action 9 shot cylinder. $225 FTF within 50 miles or so of Roseburg.
Thinning the herd a bit and this one made the list. Ruger Standard 22lr. Shows some cosmetic wear but it shoots like it is new. I have never had any issues with it. Seems to cycle everything. Comes with four mags.
Cash is king but would consider trading towards 9mm or a trijicon rmr
Walnut stock M1A in 308 had about 350 rounds through it got some brass kisses and a couple knicks but nothing serious on it. Comes with the factory 10 round mag, 10 20 round checkmate mags six of which are still in packaging, rifle bag and literature included. Only disassembled once to apply...
I am looking for a HK USP 45 FULL SIZE
I already have a Usp tac, Elite and Expert
I am not interested in crusty ones with any custom crayola accents
I would only look at and be interested in ones that are minty and have all the original items box, mags,paperwork
I do have trades but not...
1948 vintage Hi Standard H-D military built into an HDM/s clone built by , well, me. I build and sell a lot of these and at this point I would hazard to say I am the preeminent builder of them in the country. Gun has been completely stripped down and refurbished with parts as needed and new...
Silvano standard sight pusher tool, new in original box and unused. I opened it for pictures only. For sale or trade for 45 acp or 9mm projectiles for reloading.
I have an absolutely beautiful pre-64 Winchester Model 70 - serial number dates the rifle at 1951. All original and very very little wear on this one. I've owned dozens of model 70's and it is rare to find them in this condition, stock is uncut, bluing is beautiful, very few impressions/dings in...
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...