Coal quality analysis commonly used mathematical statistics terminology

No.

Term name

English name

definition

symbol

with permission
Synonyms

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Synonyms

2.7.1

Observations

Obserations

The value measured or observed in the test

 

　

　

2.7.2

Very poor

Range

The difference between the highest and lowest values ​​in a group of observations

 

　

　

2.7.3

deviation

Dcviation

The value between one observation and a specified value

 

　

　

2.7.4

Average deviation

Mean deviation

The average of the difference between each observation and its average (absolute value)

 

　

　

2.7.5

overall

Population universe

All observations as mathematical statistics objects

 

　

Mother

2.7.6

individual

Individual

One of the populations refers to an observation

 

　

　

2.7.7

Overall average

Population mean

Average of all observations in the population

μ

 

　

2.7.8

variance

Variance

The sum of the squares of the difference between each observation and its mean divided by the degree of freedom

V

 

S2