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# S1 - Median on Grouped watch

1. Hi,
I'm studying S1 on my own. A tiny uncertainty is eating at me. When working with grouped tables, some sources say when finding the position of the median just use "num of observations/2"...while others say stick to the rule of "(n + 1)/2".

It seems unlikely that a question will arise that it matters which you use...BUT, what if I did get a question that the true median position is 15.5 and observation 15 falls in group A and observation 16 falls in group B. Is this not an example where the two rules will take you different directions?

2. (Original post by Ducky_)
Hi,
I'm studying S1 on my own. A tiny uncertainty is eating at me. When working with grouped tables, some sources say when finding the position of the median just use "num of observations/2"...while others say stick to the rule of "(n + 1)/2".

It seems unlikely that a question will arise that it matters which you use...BUT, what if I did get a question that the true median position is 15.5 and observation 15 falls in group A and observation 16 falls in group B. Is this not an example where the two rules will take you different directions?

http://www.onlinemathlearning.com/me...ncy-table.html

that's what I've been taught
3. (Original post by Ducky_)
Hi,
I'm studying S1 on my own. A tiny uncertainty is eating at me. When working with grouped tables, some sources say when finding the position of the median just use "num of observations/2"...while others say stick to the rule of "(n + 1)/2".

It seems unlikely that a question will arise that it matters which you use...BUT, what if I did get a question that the true median position is 15.5 and observation 15 falls in group A and observation 16 falls in group B. Is this not an example where the two rules will take you different directions?

Find a text book that is approved by the board that you are studying for

Their version of rules will be what you want
4. Thanks guys...I'll get checking my exam board text book. If I find no certainty, I'll look to Mr Jeans method, which is probably the example I see most.

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Updated: January 6, 2013
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