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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).
Ruger Factory Mags for various guns/calibers
1. Ruger SR9 mags for 9 mm 17 round $30 each
2. Ruger LCP 380 cal 6 round $25
3. Ruger Standard 22 mags for "Standard" model $25 each
Let me know what you got. I have guns ammo accessories etc and I also have cash
I'll also take some high velocity 22 as well if you want to get rid of both but I'm mainly looking for some subsonic 22
Ruger Standard, 4-3/4" barrel, excellent condition, 2 mags, holster, original box. Year of manufacture 1975. $450.
Includes brick of .22LR ammo.
Can meet in Coos Bay, North Bend, or Myrtle Point.
For Sale is High Standard K1200 18-7 (18” barrel & 7+1 capacity) Riot 12ga. This was the model shotgun used in the move Getaway with Steve McQueen. This was mfg in 1968. Very clean. Will ship. $750 *Free Shipping OR
Selling a couple Gen 5 Glocks, only trade would be for a Glock 45 standard or MOS
$500 Gen 5 17 unfired, comes with Ameriglo Trooper night sights and 3 mags.
Available Add ons
-$100 Streamlight TLR-1HL
$625 Gen 5 17 MOS, comes with Ameriglo Idot suppressor height night sights, 2 Glock...
For sale is this rare AMT/High Standard 44 Automag package. Made in Hollywood Ca. the package includes:
The weapon itself in brushed stainless finish
Four magazines
Spare barrels, all in bright stainless:
6 1/2" 44 caliber
10" 44 caliber with Buehler scope base & rings
6 1/2"...
For Sale is a direct take off Contrast sights from a Sig P220. The are #8 Rear & #6 Front. Like NEW!
I'm selling these for $25 Cash for local sale or $30 Shipped. Due to issues with PayPal, I will only accept discreet Venmo for this item. No words in the subject line please.
I have the above primers and would like to trade straight across in 1000 primer quantities for American made Small Pistol Primers.
Thanks,
Mike M.
(541) 520-3087
Up for sale is my practically brand new cmore railway reflex sight. It was previously mounted on a ruger 10/22 so it only saw very light recoil. I've had it for about 1 year, mostly sitting in the safe
This model is the polymer version with the standard brightness knob.
2 moa dot
5 bricks (2500 rd) CCI .22 Rimfire SV
$250 for the lot. Will not separate.
I also have a quantity of Federal Auto Match
$25 per 325 round box. 4 box minimum .
Located in Vancouver.
Best,
Gary
Just found out one of Grandpas old guns just surfaced with friend of family. He's a good guy. I want to pay him fair market value for it.
Piece is a High Standard Victor model. SN ML04XXX
Good to very good condition. With box and paperwork.
Box reads
Victor Military Auto Target Pistol
22...
I have two 1,000 round cases of 7.62x39.
Downtown Seattle.
700 for both for 35 CPR. On Ammoseek I'm seeing 34 cents + 10% wa sales tax and shipping so I think you'll save like 12% here. If I'm off, let me know.
LOCAL ONLY please. Might be able to deliver in King Co.
Offered for sale only at $550.00 is a Hi Standard HD Military Pistol 22 cal. This pistol was made in May of 1946. It has left over parts, from the military contract, as well as new features incorporated into the post war production.
This pistol has the correct black cellulose acetate grips as...
I have a EUC Sig Sauer P365 standard size pistol. Comes with gun, original Sig case, 2- 10 round mags, and 1- 12 round extended mag.
Wanting $525 for everything. Prefer trade for .308 or .300win rifle
Greetings all. I have a Steyr Aug A3 M1 Standard for sale.
230 rounds fired.
Comes with 7 magazines (one Steyr, 6 magpul).
Streamlight Pro Tac 1
$1800
Can come with Vortex Viper 1-6 for $2100 total.
No trades unless it’s a C96 Mauser.