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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).
Like new SA M1A Standard, one magazine fired. FDE polymer stock. Includes three 20 round and one 10 round magazine plus its original soft case and manuals.
Machining on this example is superb and it's smooth with an excellent trigger. In like new condition with a small dent in the polymer...
High Standard Model R-101 9 shot .22lr. Nice pistol few scratches on the left side probably from holster wear. Lock up is excellent over all very good shape. Looking to get $300 Ill cover cost of shipping if it needs to be shipped. If youre local I know a store that has cheap Xfer fees. If you...
This beauty has seen 150 rounds only. Thanks for looking! Not interested in trades at the moment comes with everything pictured. Interchangeable grips, three magazines. This is a handgun built like a tank.
DA/SA. Unfortunate it has to go but hard times! Serious buyers only please send a message...
Clearing out the storage shelves.
AR magazines, mostly OKAY Industries brand. Selling in sets of three with a generic ALICE mag pouch.
$35 per set. Multiple sets available.
Great deal for someone you know just getting into the platform.
Face to face in the Clackamas area.
180 rounds. Looking for 5.56/.223. If you have steel case will trade 1:1. If brass we can negotiate. I am in canby but often go through Oregon city and Happy Valley area.
Have two new and unused standard 30mm scope rings. Ken Farrell. Probably the best out there. Also have one 0MOA Remington 700 SA base that's used but good. $125 each for the rings and $60 for the 700SA Base. Happy to ship, just message me with shipping information and I will get you a quote.
Selling my old mk1 as I recently upgraded. Pistol functions perfectly and comes with 5 mags. Transfer at rapid fire in sandy or adaptive fire solutions in OC. Fees are on you. Manufacture date is sometimes in the 1970s if I recall correctly.
Here is a fun little plinker for the kids or for the kid in you. Old but not rusty. Seems to work fine. Aftermarket magazine. $235
I CAN SHIP THIS FIREARM TO YOUR LOCAL FFL. Best bet is the Direct Message me with questions or for more pics.
Hello!
Did you buy an Aimpoint T2 and upgrade to a higher mount for it? If so, I’d like to buy your standard/low mount that came with it!
I need a low mount for it to work with my FAL.
If you have one, send me a PM with what $ you’d want for it.
Thank you,
John
I have for sale (1) never used/carried/cut Microtech Hera S/E Frag Signature Series Tactical Standard (703-1/TFRS)—s/n 052. Black in color..Complete with original box/docs.
I am asking $415 FTF/$425 shipped...
First their was the zip .22. Widely proclaimed to be the worst gun every made.
Then they made the thunderstruck which made the top five of worst guns available for many reviewers.
Then they made the switchback which is a zimak pock marked piece of utter bubblegum.
Now this. Can you say plastic...
First there was the zip .22. Widely proclaimed to be the worst gun ever made.
Then they made the thunderstruck which made the top five of worst guns available for many reviewers.
Then they made the switchback which is a zimak pock-marked piece of utter bubblegum.
Now this. Can you say plastic...
Pictured FS-2000 Standard/Optic rifle, discontinued in the states by FN Herstal about a decade ago. It's obviously the optic version, which seems to be more desirable. Not many to compare to, but prices seem to be going up.
I picked it up used last year, put about 4 mags thru it, no issues...
This is an offer for a total of 1,000 Rounds (2-500 box) for $90.00
You can buy as much as 5,000 rounds for that is presently what I have till its gone.
I bought it new last November 2023 I never used it. An extra one that's not needed. I'm in Newberg, OR.
P365, good condition with 15, 12 and two 10 round magazines. Included is a XL grip, standard Combat Wilson grip module, radial Innovations appendix holster w/Mag carrier and a kydex Bladetech holster
WTT, WTS, Ruger 10-22 Stock $50. I would prefer trade for ammo. CCI minimag 22lr, .223, 556, 9mm (124g+), .40, .45, .380, .38spl, .357mag, .44mag, 30-06, 12 guage (1-3/4"), or Beretta PX4 trinkets. I realize that the stocks not worth much, but $60 worth of ammo that someone bought for $20 isnt...