What Class boundary is
Class boundaries are the points that separate classes or groups in a data set, and they are used to create a histogram. Histograms are graphical representations of data that show how often certain values occur within a set of data.
Steps for calculating class boundaries:
-
Arrange the data in ascending order.
-
Find the lower boundary of the first class by subtracting 0.5 from the smallest value in the data set.
-
Find the upper boundary of the last class by adding 0.5 to the largest value in the data set.
-
Calculate the class width by subtracting the lower boundary of the first class from the upper boundary of the last class.
-
Divide the class width by the number of classes in the data set to find the class size.
-
Starting from the lower boundary of the first class, add the class size to find the lower boundary of each class.
-
Starting from the upper boundary of the last class, subtract the class size to find the upper boundary of each class.
Examples
-
Class boundary in statistics can be used to define the range of values that make up a particular group or class in a dataset. For example, if the values of a particular variable range from 1 to 10, the class boundaries would be 1, 3.5, 6 and 10.
-
Class boundaries can be used to create bins for data analysis. For example, if a dataset includes the total number of visitors to a website in a given day, the class boundaries could be used to create bins such as 0-10, 11-20, 21-30 and so on.
-
Class boundaries can be used to divide a dataset into different categories. For example, if data is collected on the number of hours that employees work in a week, the class boundaries could be used to separate the data into categories such as full-time, part-time or casual employees.