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Statistics S1 (OCR MEI) Thursday 22nd May 2014

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Original post by IsaacB11
Guys, I have a question...:
Ok so here is the question (if I can remember it well)
There are 3 year groups. Year 1, with 7 people, Year 2, with 2 people, and Year 3, with 2 people. There is a club formed in which 5 different people from different year groups have to be chosen. Given that it is compulsory that at least one person from each year group must be chosen, calculate the number of possible combinations of people which can be chosen for the club.
I did 7C1 x 2C1 x 2C1 (for one of each) x (6C2 + 6C1 x 1C1 + 6C1 x 1C1 + 1C1 x 1C1) (for the other three)
Which is 28 x 28
784
But I think I'm wrong :frown:
(this is for a CIE paper)


I'd work out the different combinations:

ie: (3 * year 1 and 1 * year 2 * 1 year 3 ) and so on.

Or you could do

Find the total combinations - combinations which do not work (ie: 5 year 1).
Original post by Robbo54
I'd work out the different combinations:

ie: (3 * year 1 and 1 * year 2 * 1 year 3 ) and so on.

Or you could do

Find the total combinations - combinations which do not work (ie: 5 year 1).

Yeah I found out that's the right way to do it. Thanks!
Anyone got a copy of the paper they would be willing to upload?
Original post by Infamous7
Anyone got a copy of the paper they would be willing to upload?

There's one on this thread :smile: http://www.thestudentroom.co.uk/showthread.php?t=2689279
Reply 404
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Exx
10
How much of the whole AS level was this exam worth percentage wise?
Original post by Exx
How much of the whole AS level was this exam worth percentage wise?


1/3 or since you asked for it 33.333...% :wink:

C1 - Max - 100
C2 - Max - 100
S1 - Max - 100

AS Level - Max - 300
Reply 406
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Exx
10
Original post by clayrocks
1/3 or since you asked for it 33.333...% :wink:

C1 - Max - 100
C2 - Max - 100
S1 - Max - 100

AS Level - Max - 300

Oh. thankyou
Reply 407
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Cille
3
Original post by neveroddoreven
I dont know if you've already been told but the standard deviation i got was 14.2. I'm sure that I'm right - I guess you didn't remember the answer exactly.


Did you use division by n or division by n - 1 when calculating the Standard deviation? Do they allow either?
You should have divided by n-1 because dividing it by n would have given you the RMSD, but I'm not site how strict they are on that.

•





Can someone explain how rs(spearsman) could equal one and r (product moment coefficient) doesn't.

and the reverse
Original post by penguanoe

•





Can someone explain how rs(spearsman) could equal one and r (product moment coefficient) doesn't.

and the reverse


Spearman's rank is a correlation of association between the two ranks whereas PMCC represents a positive and/or negative correlation.

Ranking could have complete correlation between eachother but not be perfectly positively correlated:tongue:

Hope that helped:yep:
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Reply 411
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TeeEm
19
Original post by Leechayy
Spearman's rank is a correlation of association between the two ranks whereas PMCC represents a positive and/or negative correlation.

Ranking could have complete correlation between eachother but not be perfectly positively correlated:tongue:

Hope that helped:yep:
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I doubt it ...
You are a year too late ...
Original post by TeeEm
I doubt it ...
You are a year too late ...


Guess who only realised AFTER they sent the message...

This guy :smug::colondollar:
Reply 413
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TeeEm
19
Original post by Leechayy
Guess who only realised AFTER they sent the message...

This guy :smug::colondollar:


:smile:
isn't the exam Wednesday?
Reply 415
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apis42
1
Original post by IGCSEKid
isn't the exam Wednesday?


This was for last year, 2014. :tongue:

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