Introduction To Class Width Statistics

Introduction to class width statistics:

Introduction to class width statistics:

Definition #1: "Class width statistics for a class in a regularity distribution is found by subtracting lesser (or upper) class limit of one class from lesser (or upper) class limit of the next class"

Definition #2: But then on a following page it shows in step formation of class width statistics:

*Determine classes.

*Find the range: R = highest value - lowest value = H - L in the example the higher number is: 158 and lower number is 120

Class Width Statistics

Is there a difference between example #1 and example #2? If so, what is it?

Get the class width statistics by dividing the ranges by the number of classes, here: W = R/ (no. of classes) thus being: 38/7 = 5.4

In class width statistics there is no variation you need to worry about is. #1 is the real definition of class width (subtract the lower limit of one class from the lower limit of the next class). As with most (mathematical) definitions, it is very abstract. To me, it seems to be trying to even apply to cases where the classes are not "connected always" (I need to make my own terminology up, because I do not remember specifically learning about class width).

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Class Width Statistics-examples:

For example, you may be looking at regularity distribution of football players in a school (let's say school has all 12 grades). The classes may be (1st and 2nd grade), (3rd and 4th grade), (5th and 6th grade) to (11th and 12th grade). So the classes are not "connected always", because the limit for the first class (2nd grade) does not coincide with the limit for the second class (3rd grade). By definition, class width = 4 - 1 for specified the first class (or 4 - 2 if you subtract the higher limits). It is not class width = 2 - 1, that is the variation in the last points of the class statistics.

In #2, it is an example. It is NOT an additional definition. In this example, the classes are connected always (like they often are). So actually you could subtract the final points of the class to get the class width (since the higher limit of one class "joins continuously"/coincides with the minor limit of the next class).

by: Omkar Nayak

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