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Question in regards to class (statistic) 
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#1
Jan3014, 06:55 AM

P: 19

Let's suppose i have a class of interval 7, say [20, 27[
With the numbers 20 21 22 23 24 25, there are 2 ways to derive the median yes? I may use [a+b[ /2 to get the median which in the case above will give me 23.5, or i may simply look at the numbers above and clearly see the median is 22.5. So my question is: Are these 2 methods to derive the median valid? I would assume so (since in terms of definition both are valid) but i want to be sure. Thank you :) 


#2
Jan3014, 08:40 AM

P: 963




#3
Jan3114, 08:35 AM

HW Helper
P: 1,372

The method of estimating the median from a class (I'm assuming you're referencing the method of estimating the median from a frequency distribution: If not I don't know what you're doing) is simply that, an estimate: the implicit assumption is that the data are spread evenly throughout the class. As your actual (small) data set shows, that isn't always the case.
In short: the result you get from using the classes in a frequency distribution should not be expected to equal the actual median. 


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