# S1 Edexcel June 2006 FeedbackWatch

12 years ago
#141
is it okay to call the upper quartile the third quartile?
I guess "Upper Quartile"..."Third Quartile" ...and "Q3"...should be acceptable...
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#142
There's an extra table which gives you the values of P(Z>z) where z is 0.3 or 0.2 .... and so you would have lost a mark for accuracy but if you used the other table you would have not got the simultaneous equations accuracy mark but the final answer rounded to 3dp should be the same.
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12 years ago
#143
For the normal distribution I got to 4 dp -0.5422 and 0.8416.
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12 years ago
#144
u can get them 2 4 dp f u use the perentage table avaliable not the normal distribution table
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12 years ago
#145
So For Normal Distrbution Question --- Can You Use The Percentage Points At The Back 0.3 And .02 ???
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#146

I know this my sound harsh but edexcel expects you to use that table, in one of their markscheme which had values like 0.3 they used it and even put in the margin: Only accept 0.5244 for A1 or something.
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12 years ago
#147
thats really unfair if they do... coz our teacher never told us about that whilst doing past papers and stuff. we just refered to orignal tables which has 2dp.

Damn, all those 10 weeks of revision for S1 gone down the drain.
i do blame myself though for reading wrong value at 0.8
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#148

See how they gave a mark for the perfect more accurate answer?
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12 years ago
#149
ok... now i just wanna punch the wall.
i should get off TSR before i hurt myself
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12 years ago
#150
Look at my scheme, they accept both.

And anyway, it was 6 marks for formulating two equations and solving them. Thats a lot to do and a lot to give marks for. They're arent going to give silly B1 marks out in this question. Don't worry.
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#151
Hmmm not the same paper though, is that a paper which is later than 2004? Perhaps they have become nicer and have given into the fact that most people didn't know about the tiny table... I guess it depends on who made the paper...
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12 years ago
#152
The question you showed was one where there were 4 marks for one simple thing. Here there were 6 marks for doing this twice and solving an equation. They just arent going to give marks out for small things like that.
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12 years ago
#153
(Original post by arsenalfan1988)
how do you get 0.8416 and -0.5244 to 4 decimal places. On my table it only had z values to 2 dp. and i got 0.77 (wrong) and -0.52 and the two z values. will i lose the marks for the others because i read the table wrong?
I "cheat" and use a TI 83+ - has functions for normal distribution, so I don't need to bother with tables

They tend to give marks for any answer that rounds up to a certain figure though, you should be ok
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#154

Hmmm another one, interesting. Especially how they give a B1 just for the value: a 9 marker that one!
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12 years ago
#155
lol doesnt that just work with my argument...6 marks for doing the same as 9 marks...? They're not getting rid of M and A marks...

At most, they maybe, might give one B mark.
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12 years ago
#156
hmm yeh i hope they accept Q3. rather forgot the correct name was upper quartile
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12 years ago
#157
Can anyone remember the individual parts to the integration question?

a) Sxx and Sxy
b) Equation of the regression y on x
c) Give the length of....?
d) Equation of the regression l on t
e) Find the length of...?
f) How reliable is your data for 90c temp

Are these right? Thanks.
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12 years ago
#158
Well ermm... here's another mark scheme.....

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12 years ago
#159
can i some draw up a correct solution to this normal distrubution question
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12 years ago
#160
this thread makes me want to cry...
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