# standard error

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Related to standard error: variance

## standard error (S.E.)

(in statistics) the variability in scores that can be expected if measurements are made on random samples of the same size from the same universe of populations, phenomena, or observations. The standard error provides a framework within which a determination of the difference between groups may be made. It is an element used in determining statistic significance by means of a wide variety of formulas and methods.

## standard error

Abbreviation:**S.E.**

A measure of variability that could be expected of a statistical constant following the taking of random samples of a given size in a particular set of observations. An important standard error is that of the difference between the means of two samples.

See also: error

## standard error

an estimate of the STANDARD DEVIATION of the means of many samples, calculated as the standard deviation (*s*) divided by the square root of the number of individuals in a sample

*(n),*i.e.

*s*/V

*n*. See

**Fig. 288**. The SE can be used to assess any SIGNIFICANCE in the deviation of the mean of a sample from the true mean of the whole population.

## standard

something established as a measure or model to which other similar things should conform.

**bacteriological standard of meat**

the standard bacterial count of meat beyond which local legislation forbids the sale or use of meat. The international standard is for <107/g of meat and that

*Salmonella*spp. should not be present in more than one of five 25 g samples, all held at 95°F (35°C) or 68°F (20°C) for chilled meat.**standard bicarbonate**

in blood gas analysis this is the plasma level of bicarbonate, under specified conditions, which eliminates the influence of respiration on the values obtained.

**standard deviation**

a measure of the dispersal of a random variable; the square root of the average squared deviation from the mean. For data that have a normal distribution about 68% of the data points fall within one standard deviation from the mean and 95% fall within two standard deviations. Symbol is σ.

**standard error**

the standard deviation of an estimate.

**standard error of mean**

the sampling variability of the mean.

**standard international (SI) units**

see Table 3.

**standard population**

a population not yet divided into classes; the population against which each of its constituent classes can be compared.

**standard**

*Salmonella pullorum*strainsstrains that contain only small amounts of 12

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