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# Statistics unit 1 - median question Watch

1. Hey,

I've got a general question concerning the median etc. in S1. When using the equation to find the term of the median or other quartiles, when do you decide to use 'n/1' and when would you use '(n+1)/1'?

I always get mixed answers from teachers, yet the mark scheme is getting quite strict as to when a pupil can use either or.

2. (Original post by Me Gusta)
Hey,

I've got a general question concerning the median etc. in S1. When using the equation to find the term of the median or other quartiles, when do you decide to use 'n/1' and when would you use '(n+1)/1'?

I always get mixed answers from teachers, yet the mark scheme is getting quite strict as to when a pupil can use either or.

Does it tell you in the specification for the particular board you're with?
3. (Original post by ghostwalker)
Does it tell you in the specification for the particular board you're with?
I experience the same problem as well. I'm on Edexcel, any advice?
Thanks
4. (Original post by krisshP)
I experience the same problem as well. I'm on Edexcel, any advice?
Thanks
You're likely to have better access to the specification than I am.

I'd not come across the use of just "n" until recently on this forum. "n+1", or the method outline by Thieta were the ones I'm familar with. The various methods, means that there is no real standard, and as such the exam boards methodology, either via their specs. or their books (though these often seem to contain errors) would be the best way to go to find out what method they want you to use.
5. (Original post by ghostwalker)
You're likely to have better access to the specification than I am.

I'd not come across the use of just "n" until recently on this forum. "n+1", or the method outline by Thieta were the ones I'm familar with. The various methods, means that there is no real standard, and as such the exam boards methodology, either via their specs. or their books (though these often seem to contain errors) would be the best way to go to find out what method they want you to use.
But the spec pretty much just says
Calculation of mean, mode and median, range and interquartile range will not be the direct focus of examination questions. Students will be expected to draw simple inferences....
Under measures of location-mean, Medina and mode

It doesn't tell us which to use, n or n+1 method
6. Is there no past paper where we have to find the median of an even number? Probably because of this.
7. (Original post by Air1337)
Is there no past paper where we have to find the median of an even number? Probably because of this.
There are a few.

I'm with OCR MEI, and we were told to use n for odd sets of data and n+1 for even sets of data.

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8. (Original post by x-Sophie-x)
There are a few.

I'm with OCR MEI, and we were told to use n for odd sets of data and n+1 for even sets of data.

Posted from TSR Mobile
Hmm I'm referring to Edexcel since they don't specify in the specification. From what I remember none of the papers I did involved finding the median of an even number.
9. (Original post by Air1337)
Hmm I'm referring to Edexcel since they don't specify in the specification. From what I remember none of the papers I did involved finding the median of an even number.
What method did you do?
10. (Original post by krisshP)
What method did you do?
I've been taught to use n/2. Say n = 30. Then we get 15 therefore we take the average of 15 and 16.

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