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The Edexcel S2 (24/05/12 - AM) Revision Thread
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Grade boundaries up to Jan 12:
Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
(edited 11 years ago)
Original post by Lostmoon9
Grade boundaries up to Jan 12:
Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
Nice one
Original post by Lostmoon9
Grade boundaries up to Jan 12:
Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
So high!
Bloody high boundaries
Original post by Groat
So high!
Now now. I know that exam periods are often stressful but that's no excuse to take drugs!
You know for June 2010 question: "A rectangle has a perimeter of 20cm. The length, X cm, of one side of this rectangle is uniformly distributed between 1cm and 7cm. Find the probability that the length of the longer side of the rectangle is more than 6cm long"
Now I understand how you get the Y~U [3,9] distribution
because X + Y = 10cm
so 7 3
6 4
5 5
4 6
3 7
2 8
1 9
and the question asks find the probability that the length of the longer side of the rectangle is more than 6cm long. So I get why you have to work out P(y>6) in the Y~U[3,9] distribution. But, why do you have to work out P(X>6) in the X~U[1,7] distribution when that's clearly the shorter side since its length is between 1 and 7cm and the length between the other side is between 3 and 9cm.
Could someone please clarify this! I know it's kind of a stupid q, but I don't understand why you would work out P(X>6) when that's the shorter side of the rectangle
Now I understand how you get the Y~U [3,9] distribution
because X + Y = 10cm
so 7 3
6 4
5 5
4 6
3 7
2 8
1 9
and the question asks find the probability that the length of the longer side of the rectangle is more than 6cm long. So I get why you have to work out P(y>6) in the Y~U[3,9] distribution. But, why do you have to work out P(X>6) in the X~U[1,7] distribution when that's clearly the shorter side since its length is between 1 and 7cm and the length between the other side is between 3 and 9cm.
Could someone please clarify this! I know it's kind of a stupid q, but I don't understand why you would work out P(X>6) when that's the shorter side of the rectangle
(edited 11 years ago)
Original post by Phenylethylamine_
You know for June 2010 question: "A rectangle has a perimeter of 20cm. The length, X cm, of one side of this rectangle is uniformly distributed between 1cm and 7cm. Find the probability that the length of the longer side of the rectangle is more than 6cm long"
Now I understand how you get the Y~U [3,9] distribution
because X + Y = 10cm
so 7 3
6 4
5 5
4 6
3 7
2 8
1 9
and the question asks find the probability that the length of the longer side of the rectangle is more than 6cm long. So I get why you have to work out P(y>6) in the Y~U[3,9] distribution. But, why do you have to work out P(X>6) in the X~U[1,7] distribution when that's clearly the shorter side since its length is between 1 and 7cm and the length between the other side is between 3 and 9cm.
Could someone please clarify this! I know it's kind of a stupid q, but I don't understand why you would work out P(X>6) when that's the shorter side of the rectangle
Now I understand how you get the Y~U [3,9] distribution
because X + Y = 10cm
so 7 3
6 4
5 5
4 6
3 7
2 8
1 9
and the question asks find the probability that the length of the longer side of the rectangle is more than 6cm long. So I get why you have to work out P(y>6) in the Y~U[3,9] distribution. But, why do you have to work out P(X>6) in the X~U[1,7] distribution when that's clearly the shorter side since its length is between 1 and 7cm and the length between the other side is between 3 and 9cm.
Could someone please clarify this! I know it's kind of a stupid q, but I don't understand why you would work out P(X>6) when that's the shorter side of the rectangle
Because if Suppose X = 7, then the other side will be the shorter side, you have to consider each case.
Original post by Extricated
Because if Suppose X = 7, then the other side will be the shorter side, you have to consider each case.
Oh I get it! I'm so stupid, lol. Thanks
Original post by Warfare
Okay, but why is it P(X>9)?? When will it be P(X<9) or something. Can you gave me the basic lecture? This is a major issue with the exam coming up and can't get my head wrapped around it?
Hey, for these questions where its 2 tailed, to see whether you do P(X>9) or P(X<9) you have to find the mean which is np
So in this case you do 20 times 0.2=4
Then you look at the value your given and see if it is above or below the mean
If its above the mean you look for P(x>9) for example, and if its below the mean, for example 2, you do P(X<2)
Hope this helps!
Original post by reb306
Hey, for these questions where its 2 tailed, to see whether you do P(X>9) or P(X<9) you have to find the mean which is np
So in this case you do 20 times 0.2=4
Then you look at the value your given and see if it is above or below the mean
If its above the mean you look for P(x>9) for example, and if its below the mean, for example 2, you do P(X<2)
Hope this helps!
So in this case you do 20 times 0.2=4
Then you look at the value your given and see if it is above or below the mean
If its above the mean you look for P(x>9) for example, and if its below the mean, for example 2, you do P(X<2)
Hope this helps!
thanks alot
dreading this exam, revised in jan for it, came out with a C after thinking I did okay. Stats is just T_T, core modules i find fine and get A's in but stats I always make mistakes on. Going to start revision this weekend for it, with a few past papers. I think I have some notes saved on my comp from a long time ago (definitions), I am not sure if they have been posted but if someone wants them I can post them up on this thread.
absolutely dreading this exam... :'( stats is bringing down my overall grade 
Original post by Lostmoon9
Grade boundaries up to Jan 12:
Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
Session 100 90 80 70 60 50 40
Grade A* A B C D E
Jun-01 75 68 60 52 45 38 31
Jan-02 69 63 57 51 45 40 35
Jun-02 72 65 58 51 44 37 30
Jan-03 70 64 58 52 47 42 37
Jun-03 71 64 57 50 44 38 32
Jan-04 73 67 61 55 49 43 38
Jun-04 75 70 64 57 50 44 38
Jan-05 70 63 56 49 43 37 31
Jun-05 75 68 61 54 48 42 36
Jan-06 73 66 59 52 45 39 33
Jun-06 75 71 66 58 50 43 36
Jan-07 75 71 66 58 50 42 34
Jun-07 75 69 63 55 48 41 34
Jan-08 75 69 62 54 46 39 32
Jun-08 75 70 65 58 51 44 37
Jan-09 75 70 65 57 49 41 33
Jun-09 75 69 62 54 46 38 30
Jan-10 75 70 65 57 50 43 36
Jun-10 75 68 62 54 46 38 31
Jan-11 75 72 69 62 55 48 42
Jun-11 75 67 59 50 41 33 25
Jan-12 75 70 66 60 54 48 43
Anybody else noticed the grade boundaries for A* is in a sequence for June papers since 2008?
June 2008 - 70
June 2009 - 69
June 2010 - 68
June 2011 - 67
So extrapolate for June 2012... 66 marks??
Original post by ezioaudi77
Anybody else noticed the grade boundaries for A* is in a sequence for June papers since 2008?
June 2008 - 70
June 2009 - 69
June 2010 - 68
June 2011 - 67
So extrapolate for June 2012... 66 marks??
June 2008 - 70
June 2009 - 69
June 2010 - 68
June 2011 - 67
So extrapolate for June 2012... 66 marks??
It doesnt really work like that lol. Would love it to be 66 but in reality, that probably wont be the case. In any case, it's useless trying to draw conclusions from past examinations.
Original post by -Illmatic-
It doesnt really work like that lol. Would love it to be 66 but in reality, that probably wont be the case. In any case, it's useless trying to draw conclusions from past examinations.
Yes, I know. Reality sucks, so let me bask in the bliss for a moment :P
I just understood hypothesis testing about a week or two ago, before then I was just rote learning it. It really does make sense, you have a model, how likely is it that you'll get <insert some event> under this model? if it's greater than 0.xx or less than 0.yy etc is it really going to happen under the model? if not then chances are the model is false, ignore H0. simple logic which somehow always clicks near exam period.
clickedy click.
clickedy click.
(edited 11 years ago)
Original post by ezioaudi77
Anybody else noticed the grade boundaries for A* is in a sequence for June papers since 2008?
June 2008 - 70
June 2009 - 69
June 2010 - 68
June 2011 - 67
So extrapolate for June 2012... 66 marks??
June 2008 - 70
June 2009 - 69
June 2010 - 68
June 2011 - 67
So extrapolate for June 2012... 66 marks??
nope, the past grade boundaries obey a uniform distribution with width 3 and hieight 1/3. E(X) = (70+67)/2 = 68.5. Round that to 69. I vote 69
.Original post by Ilyas
nope, the past grade boundaries obey a uniform distribution with width 3 and hieight 1/3. E(X) = (70+67)/2 = 68.5. Round that to 69. I vote 69 .
.(I can't believe I'm doing this) Your model is less accurate. Because, let's say it's 2011 and we want to find out the grade boundary for A* in 2011. Then "width" and "height" would be 2 and 1/2. So the expected value for 2011 would be = (70+68)/2 = 69.
But the actual value was 67.
But if you fit it into a regression line, y = 70 - (x - 2008), where y is the grade boundary and x is the year, it is more accurate.
But we will have to wait till mid-July to find out what is more accurate for 2012
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