Statistical Class

Statistical Class

Each of the successive intervals in which is divided the total interval of variation of a quantitative statistical variable.

The size of these intervals is called the amplitude of the statistical class.

Example

Mass of 190 students at school
Mass
(in kg)
Numbers
of students
[36, 38[
[38, 40[
[40, 42[
[42, 44[
[44, 46[
[46, 48[
[48, 50[
[50, 52[
14
20
25
35
44
32
15
5
Total 190

Based on this table, we grouped the data into 8 classes.

The amplitude or dimension, or range) of each class is 2.

For the class [36, 38[, the lower bound is 36 and the upper bound is 38.

The frequency of the class [36, 38[ is 14.

The range of the distribution is 23, because: E = 52 − 36 = 23.

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