IB boundaries? Watch

MoNag
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So I'm in IB Chem SL and don't really understand the logic behind the way my teacher marks our tests. It's her first year in IB so I'm somewhat skeptical.
We recently had a test with 2 papers, here are the boundaries she set:
Paper 1(MCQ): Paper 2:
18/20=7 35/40=7
16/20=6 30/40=6
14/20=5

Ok so my results were:
Paper 1: 15/20, which is a level 5
Paper 2: 39/40, which is a level 7
My overall mark was 54/60
- She then said that my overall level was a level 6.
Another student got:
Paper 1: 16/20, which is a level 6
Paper 2: 35/40, which is a level 7
Total was 51/60
- The teacher says that this student's level was a 7.

So is this how the IB really mark? The reason Im a 6 is because the average of 5 and 7 is 6.
The reason she is a 7 is because she got 6 on 1 paper and 7 on the other, 6.5 goes to a 7.
What bothers me is that my total is 3 marks higher, yet I'm a level below.
Just wanted to make sure because this test determines my predict so it does make a difference.
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charco
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(Original post by MoNag)
So I'm in IB Chem SL and don't really understand the logic behind the way my teacher marks our tests. It's her first year in IB so I'm somewhat skeptical.
We recently had a test with 2 papers, here are the boundaries she set:
Paper 1(MCQ): Paper 2:
18/20=7 35/40=7
16/20=6 30/40=6
14/20=5

Ok so my results were:
Paper 1: 15/20, which is a level 5
Paper 2: 39/40, which is a level 7
My overall mark was 54/60
- She then said that my overall level was a level 6.
Another student got:
Paper 1: 16/20, which is a level 6
Paper 2: 35/40, which is a level 7
Total was 51/60
- The teacher says that this student's level was a 7.

So is this how the IB really mark? The reason Im a 6 is because the average of 5 and 7 is 6.
The reason she is a 7 is because she got 6 on 1 paper and 7 on the other, 6.5 goes to a 7.
What bothers me is that my total is 3 marks higher, yet I'm a level below.
Just wanted to make sure because this test determines my predict so it does make a difference.
The IB gives a mark for each paper calculates a weighted value and then calculates the overall percentage by summing the weighted numbers. They then compare this to a series of levels decided by the IB exam committee for each subject. (They strongly deny any use of bell curves)

The new grades are based on 4 papers:

Standard level
Paper 1: 30 marks = 20%
Paper 2: 50 marks = 40%
Paper 3: 35 marks = 20%
Paper 4 (IA): 30 marks = 20%
--------------------------------------

Higher level
Paper 1: 40 marks = 20%
Paper 2: 95 marks = 36%
Paper 3: 45 marks = 24%
Paper 4 (IA): 30 marks = 20%
--------------------------------------

Actual grade boundaries vary from year to year:

Here's the boundaries for May 2013 TZ2
Standard level
Grade:1 Mark range: 0 - 17
Grade:2 Mark range: 18 - 34
Grade:3 Mark range: 35 - 45
Grade:4 Mark range: 46 - 56
Grade:5 Mark range: 57 - 67
Grade:6 Mark range: 68 - 78
Grade:7 Mark range: 79 - 100

Higher level
Grade:1 Mark range: 0 - 17
Grade:2 Mark range: 18 - 32
Grade:3 Mark range: 33 - 45
Grade:4 Mark range: 46 - 56
Grade:5 Mark range: 57 - 67
Grade:6 Mark range: 68 - 77
Grade:7 Mark range: 78 - 100

That said, grade 7 has been as high as 84% in the past.

I personally err on the side of caution and assume that the best grade in IA will be moderated to 80% and from that recalculate the percentage needed for each grade level as:
85, 70, 60, 50 , 35 and 20 %
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MoNag
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(Original post by charco)
The IB gives a mark for each paper calculates a weighted value and then calculates the overall percentage by summing the weighted numbers. They then compare this to a series of levels decided by the IB exam committee for each subject. (They strongly deny any use of bell curves)

The new grades are based on 4 papers:

Standard level
Paper 1: 30 marks = 20%
Paper 2: 50 marks = 40%
Paper 3: 35 marks = 20%
Paper 4 (IA): 30 marks = 20%
--------------------------------------

Higher level
Paper 1: 40 marks = 20%
Paper 2: 95 marks = 36%
Paper 3: 45 marks = 24%
Paper 4 (IA): 30 marks = 20%
--------------------------------------

Actual grade boundaries vary from year to year:

Here's the boundaries for May 2013 TZ2
Standard level
Grade:1 Mark range: 0 - 17
Grade:2 Mark range: 18 - 34
Grade:3 Mark range: 35 - 45
Grade:4 Mark range: 46 - 56
Grade:5 Mark range: 57 - 67
Grade:6 Mark range: 68 - 78
Grade:7 Mark range: 79 - 100

Higher level
Grade:1 Mark range: 0 - 17
Grade:2 Mark range: 18 - 32
Grade:3 Mark range: 33 - 45
Grade:4 Mark range: 46 - 56
Grade:5 Mark range: 57 - 67
Grade:6 Mark range: 68 - 77
Grade:7 Mark range: 78 - 100

That said, grade 7 has been as high as 84% in the past.

I personally err on the side of caution and assume that the best grade in IA will be moderated to 80% and from that recalculate the percentage needed for each grade level as:
85, 70, 60, 50 , 35 and 20 %
That makes sense, so you're saying they weigh the percentage on each paper and not the level achieved.
My teacher weighed the levels achieved, since we had 2 papers she used the following weights:
Paper 1: 35%
Paper 2: 65%.
She then weighed my level for each paper in the following manner:
Paper 1: 5 x 0.35= 1.75
Paper 2: 7 x 0.65= 4.55
Total: 4.55 + 1.75= 6.3, where she got my level 6 from.

You're saying that the IB would do the calculation like this:
Paper 1: 75% x 0.35= 26.25%
Paper 2: 97.5% x 0.65= 63.375%
Total= 26.25% + 63.375%= 89.6%
Which would be a level 7 on IB boundaries yes?
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charco
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(Original post by MoNag)
That makes sense, so you're saying they weigh the percentage on each paper and not the level achieved.
My teacher weighed the levels achieved, since we had 2 papers she used the following weights:
Paper 1: 35%
Paper 2: 65%.
She then weighed my level for each paper in the following manner:
Paper 1: 5 x 0.35= 1.75
Paper 2: 7 x 0.65= 4.55
Total: 4.55 + 1.75= 6.3, where she got my level 6 from.

You're saying that the IB would do the calculation like this:
Paper 1: 75% x 0.35= 26.25%
Paper 2: 97.5% x 0.65= 63.375%
Total= 26.25% + 63.375%= 89.6%
Which would be a level 7 on IB boundaries yes?
If you're only doing papers 1 & 2 the weightings would be 20:40 for standard level, so your percentage would be (15 + 39) x 100/60 = 90%
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