Edexcel Mathematics 15th November 2010 handlling data

dsi21

1

Hi everyone
Thoughts on the exam, i thought it was really easy

Reply 1

TheFootyKing19

10

Yeah..Yeah Paper A was Faaab.

What did you put for the last question for Section B?

Reply 2

Benmaster

Yeah, I thought this exam was alright too, but there's gonna be really high boundaries (29/30 for A*)

(edited 13 years ago)

Reply 3

Benmaster

Original post by thefootyking19

yeah..yeah paper a was faaab.

What did you put for the last question for section b?

27/55 (54/110)

Reply 4

r88ney

Section B, last question = 54/110 (I put) or 27/55 :biggrin:

I asked my teachers after the exam aswell xD
Im just wondering about the survery question, could anybody tell me whether this is right or wrong:

How much do you spent at the supermarket each week?
0(none) -- £0.01-£5 -- £5.01-£10 -- £10.01-£15 -- £15.01-£20 -- £20.01+

Also 2 reasons why that other survey question was wrong:
1) there was no time interval. E.g = how much money spent in a week?
2) There was no box for 0(none) money spent at the supermarket

Otherwise I belive i have gotten full marks :smile:

(edited 13 years ago)

Reply 5

Benmaster

Original post by r88ney

Section B, last question = 54/110 (I put) or 27/55 :biggrin:

I asked my teachers after the exam aswell xD
Im just wondering about the survery question, could anybody tell me whether this is right or wrong:

How much do you spent at the supermarket each week?
0(none) -- £0.01-£5 -- £5.01-£10 -- £10.01-£15 -- £15.01-£20 -- £20.01+

Also 2 reasons why that other survey question was wrong:
1) there was no time interval. E.g = how much money spent in a week?
2) There was no box for 0(none) money spent at the supermarket

Otherwise I belive i have gotten full marks :smile:

Yeah, Hi. Survey question is definitely right, I had more or less identical response boxes to you aswell. I got the time interval one aswell, for the other reason I put the boxes were too vague, I'm not really sure if I'll get that, but yours is probably right.. Also for the grouped mean did you get 34?

(edited 13 years ago)

Reply 6

r88ney

many, many people wrote too vague, soo you should have gotten it right :smile:

yepp my mean was 34 :biggrin:

(1020 divide by 30 = 34)

for section B did you get 54/110?

question =
3 jar's of honey, 8 jar's of jam -- total 11
what is the probability of getting at least one jar of honey?

I did:
8/11 x 7/10 = 56/110, 110/110(equivalent to 1) - 56/110 = 54/110 :smile:

P.S = I'm pretty sure it was, without replacement :smile:

(edited 13 years ago)

Reply 7

Benmaster

Original post by r88ney

many, many people wrote too vague, soo you should have gotten it right :smile:

yepp my mean was 34 :biggrin:

for section B did you get 54/110?

question =
3 jar's of honey, 8 jar's of jam -- total 11
what is the probability of getting at least one jar of honey?

I did:
8/11 x 7/10 = 56/110, 110/110(equivalent to 1) - 56/110 = 54/110 :smile:

Yep, I did exactly that for the probability one (we did it the clever way, other people would've done it the long way); the only question I'm concerned about is the Box plot comparisons, for my first reason I wrote Girls have a smaller range, for the second I wrote Boys have a larger IQ range, I think one of them has to be about the median?

Reply 8

r88ney

Original post by Benmaster

Yep, I did exactly that for the probability one (we did it the clever way, other people would've done it the long way); the only question I'm concerned about is the Box plot comparisons, for my first reason I wrote Girls have a smaller range, for the second I wrote Boys have a larger IQ range, I think one of them has to be about the median?

Ouch!
I think you mean IQR not IQ lol.
It has to be the spread(range or IQR) and the median.
So, sadly you did lose 1 mark there :frown:

Reply 9

r88ney

haha, wouldn't call you sad for asking that to the exam board :smile:

hmmm.. you might just get full marks :smile:

Well it all depends on how generous the examiner is :smile:

So yes, you can still have hope :smile:

Note the fact that he said "very few candidates", so it does depend on chance.
Also, did you actually state HQ-LQ=IQR for both box plots, and say by how much bigger it is, than the other?
Also, for range did you also say how much bigger the box plot is, than the other?
If you did state this, they would think you put a lot of hard effort into it, thus awarding you full marks :smile:

(edited 13 years ago)

Reply 10

Benmaster

The really annoying thing is I wrote about the median before crossing it out and writing something about range really small next to it.. Urghh!! why did I do that!?!

Reply 11

r88ney

Original post by Benmaster

The really annoying thing is I wrote about the median before crossing it out and writing something about range really small next to it.. Urghh!! why did I do that!?!

Ok, I dont want to demorlise you or anything, but I belive this greatly reduces your chance of getting full marks :frown:

1 mark = 4% UMS (roughtly)
A* = 29/30 = 76% UMS

So, you should still get A* but, you will miss out full marks.

P.S = For the frequency density did you go up in 2's (each 1 boxe going up = 1)
I just did 2,4,6
The highest FD was 5 and the lowest was 1(5 divided by 5)

(edited 13 years ago)

Reply 12

dsi21

OP

1

Original post by TheFootyKing19

Yeah..Yeah Paper A was Faaab.

What did you put for the last question for Section B?

i put 30/110 i am pretty sure that is right as i times th honey and honey and also the honey and the jam one. I added them together which is 30/110 i am pretty sure that is right

Reply 13

r88ney

Original post by dsi21

i put 30/110 i am pretty sure that is right as i times th honey and honey and also the honey and the jam one. I added them together which is 30/110 i am pretty sure that is right

Im sorry to break it to you, but your 100% wrong.
Read above to see my working out.
My teachers got access to the papers, and worked it out.
Its 100% 54/110 or simplified 27/55 whichever, they are both right.

You may get marks however, for the working out (showing the tree diagram and labelling correctly)

Reply 14

Stardust Mirage

10

I messed up on that paper =( first of all the survey question I put like 5-10 and 11-15... and the best line of fit was a bit dodgey I wanted to change it but time ws up and what did you guys get for the 4 point moving average. I got someting like 40.5on the first one. Im sure i added it correctly. I would like to ask would you get an mark for a correct estimate on a wrong line of best fit. thanks

Reply 15

Awesome-ness

Hi all.
Are we all talking about the higher?
I thought it was pretty straightforward. I thinkk I messed up on the last question on Paper 3 (non-calculator). I found out after the exam that I should have drawn a circle. Oh well. :smile:

When do the results come out? xx

Reply 16

Benmaster

Original post by Awesome-ness

Hi all.
Are we all talking about the higher?
I thought it was pretty straightforward. I thinkk I messed up on the last question on Paper 3 (non-calculator). I found out after the exam that I should have drawn a circle. Oh well. :smile:

When do the results come out? xx