1. A range of values in a frequency distribution table used to group continuous data into categories
In the histogram, each class interval represents a range of 10 units, from 0-10, 10-20, and so on.
No histograma, cada intervalo de classe representa um intervalo de 10 unidades, de 0-10, 10-20, e assim por diante.
2. The span or width between the lower and upper limits of a class in a statistical frequency distribution
The class interval width was calculated by subtracting the lower limit from the upper limit.
A largura do intervalo de classe foi calculada subtraindo o limite inferior do limite superior.
Class interval is a fundamental concept in Brazilian and Portuguese statistics education, used extensively in secondary school mathematics and university-level statistics courses. It is a technical term with no colloquial variations or regional slang equivalents.