May 19, 2020
How can you calculate class interval?
Class interval refers to the numerical width of any class in a particular distribution. It is defined as the difference between the upper-class limit and the lower class limit.
Class Interval = Upper-Class limit – Lower class limit.
In statistics, the data is arranged into different classes and the width of such class is called class interval.
Class Interval exercise to try
The following data are weights of people on a diet
plan;
{52, 75, 92, 101, 83, 68, 133, 78, 104, 61, 39, 46, 135, 87,
131, 99, 104, 86, 67, 116, 89, 57, 87, 98, 131, 116, 135, 93}
a) With a class interval of 14, determine how many classes you get
b) Presents these weights by use of a frequency distribution table
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Help me to know how to calculate class interval in statistics for example the class interval is given as 14. How would you solve that?
Me too i did’nt understand why it becomes 14😭
C=(highest-lowest)/no. of groups
*Highest and lowest are given on the tally sheet.
Example:
C= (85-34) / 7
= 51/7
= 7.29
= 7
*Class interval should be a whole number*
But the class interval here is 14
Count the given numerical data….you’ll get the count of 14🙂
Where did you get the 7?
I didn’t understand how it is 14?
The following data are weights of people on a diet
plan; {52, 75, 92, 101, 83, 68, 133, 78, 104, 61, 39, 46, 135, 87,
131, 99, 104, 86, 67, 116, 89, 57, 87, 98, 131, 116, 135, 93}a) With a class interval of
14, determine how many classes you get (4 marks)b) Presents these weights by
use of a frequency distribution table (6 marks)
c) From b)
calculate the average weight (5 marks
Class Interval=Range/No of ClassesHence, No of Classes=Range/Class IntervalRange= Higher No-Lowest No=135-39=96No of Class=96/14=6.85 ClassesHope this will help. Let me know for any further clarification.
Is it right to decide on the number of classes first? If so, then how does one get to the optimal number of classes?
what if class interval is not given? how to get it?
A)14
Will the class interval be given always? If No, how does one calculate for class interval