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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 8 boxes of ELEY Match and 7 boxes SK Standard plus left over from bricks that I was testing that I’d like to sell.
ELEY Match $16/box(50)
SK Standard Plus $8/box(50)
I’m not willing to ship but can meet close to Auburn if you’re interested in multiple boxes.
I’m interested in trades for...
Great Revolver, in good shape. Grip is just wrapped, not covering anything. Can include holster. Looking for an RMRcc or cash mainly. Or stock Glock 43X or 48 mos, 43 or partial trade for a frame.
Item:
BCM® Standard 11.5" (Enhanced Lightweight) Carbine Upper Receiver Group w/ MCMR-10 Handguard w/ BCG
Price:
$600
Location:
Portland. Will ship if you pay
This is brand new, never even mounted to a lower. Comes with the hardware shown, decals and the BCM BCG. I changed my mind on my...
Impulse bought this yesterday from Oregon rifle worlds for 310. Decided it’s really not for me. Asking 300. May trade for ammo or for a firearm. Or with my other classifieds for something? Pm me! Meet in Hillsboro.
Selling my Glock 20 10mm auto. comes with 3 standard magazines. Barrel length is 4.5 inches Comes with and extra Lone Wolf barrel that is treaded. Its a low Gen model probably Gen 1 or 2. i've owned it for 10 years and got it on a trade. Has a low round count and functions perfectly with reloads...
One sale pending and one trade pending after that....
2 new, two lightly used.
All appear to work perfectly
Trade for .500 bullets
Trade for 300 win mag brass
$30obo cashapp or cash
$110 per Brick
misterarman
AKA
John
360.771.0013
To see my other ads click on my avatar, then click on my avatar again in the new box that pops up. Then click on the "FIND Box" and then click on "Find All Thread By "misterarman" in the dropdown box.
Straight trade
Have about 700 large magnum rifle primers I cannot use and I’d like to trade for standard large rifle. Would even trade few hundred….. whatever you want
Local…… Kent, Covington, auburn….. during work days I meet Redmond, Bellevue
Which one would you choose
10. San Jose
Standard issue service-weapon(s): Sig Sauer P225, Sig Sauer P226,Glock 17, and Glock 19 (officers can also elect to carry a variety of approved firearms while on duty at their own expense, including Beretta and Smith & Wesson semi-automatics and Colt and...
82 Hk G3 Mags (20 rnd)
I have 25 Mags in original packaging. All Mags are functional.
Used light rust in spots: $6.00 ea.
Used no rust: $7.00 ea.
New old stock in original paper wraped: $8.00ea.
New old stock in paper, sealed in plastic: $9.00ea.
This is a High Standard 22 mag stainless steel derringer in excellent condition. Have the original box. I have two sets of grips. The ones shown and a set of black plastic. Comes with a collector wallet holster. Note: the firearm can not be carried in the wallet per ATF regulations. Holster...