GB/T 4891-2008Choice of sample size for estimating the average quality of a lot or process (English PDF)

3.1 Terms and Definitions

The following terms and definitions apply to this standard.

3.1.1

Overall comprises N sampling units in the sample drawn without replacement by state units, if the probability of any state units are being withdrawn phase

Etc., that is equal to 1/C

N, claimed that this sampling method is simple random sampling.

Note 1. Simple random sampling can use the following methods extracting unit individually. The first unit random sample from the population of all the N sampling units

Extraction, and the second sample cell from the rest of the N-1 sampling units at random, and so on.

Note 2. Press the simple random sampling to obtain samples called a simple random sample (simplerandom-sample).

[ISO 3534-1.2006,1.3.4]

3.1.2

Under specified conditions, the degree of mutual agreement between independent test results.

Note. The absolute error limit depends only on the random error, and has nothing to do with the value of true value is measured or other agreement.

[ISO 3534-1.2006,4.11]

3.1.3

Sampling for the purpose of pooling part of the same substance has an overall condition.

NOTE. The purpose of sampling can be assured of receiving the grant, or estimated average individual characteristics.

[ISO 3534-2.2006,1.2.4]

3.1.4

A set of inputs into output of interrelated activities or interacting.