Equal and Unequal Class Interval Series
Equal Class Interval Series:
When the classes of a series are of the same interval, it is known as Equal Class Interval Series.
Example of Frequency Distribution in Equal Class Interval Series
Following is the frequency distribution of marks of 25 students with equal class intervals.
Unequal Class Interval Series:
When the classes of a series are of unequal interval, it is known as Equal Class Interval Series.
Example of Frequency Distribution in Unequal Class Interval Series
Following is the frequency distribution of marks of 30 students with unequal class intervals.
Types of Frequency Distribution
It is not always possible for an investigator to easily measure the items of a series or set of data. To make the data simple and easy to read and analyze, the items of the series are placed within a range of values or limits. In other words, the given raw set of data is categorized into different classes with a range, known as Class Intervals. Every item of the given series is put against a class interval with the help of tally bars. The number of items occurring in the specific range or class interval is shown under Frequency against that particular class range to which the item belongs.
Table of Content
- Example of Frequency Distribution
- Types of Frequency Distribution
- 1. Exclusive Series
- 2. Inclusive Series
- 3. Open End Series
- 4. Cumulative Frequency Series
- 5. Mid-Value Frequency Series
- 6. Equal and Unequal Class Interval Series