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2. Standard deviation - Wikipedia

   en.wikipedia.org/wiki/Standard_deviation

   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).

3. Sampling (signal processing) - Wikipedia

   en.wikipedia.org/wiki/Sampling_(signal_processing)

   A sample is a value of the signal at a point in time and/or space; this definition differs from the term's usage in statistics, which refers to a set of such values. [ A ] A sampler is a subsystem or operation that extracts samples from a continuous signal .

4. Standard error - Wikipedia

   en.wikipedia.org/wiki/Standard_error

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

5. Stool Sample Culture Test: Purpose, Procedure ... - WebMD

   www.webmd.com/a-to-z-guides/what-is-a-stool-culture

   Avoid getting urine mixed up with your stool. If you need to pee, do so before starting. Put the container in a sealed plastic bag and wash your hands well with soap and water.Flush any leftover ...

6. Epithelial Cells in Urine: Types, Test Results, Causes, and More

   www.healthline.com/health/epithelial-cells-in-urine

   This prevents contaminants from your skin, like epithelial cells, from showing up in your sample. Your doctor can help you understand your test results and whether you have a medical condition ...

7. Form 4473 - Wikipedia

   en.wikipedia.org/wiki/Form_4473

   ATF Form 4473, October 2016 revision. A Firearms Transaction Record, or ATF Form 4473, is a seven-page form prescribed by the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) required to be completed when a person proposes to purchase a firearm from a Federal Firearms License (FFL) holder, such as a gun dealer.