AT LAST! Edexcel S1 May 2008 Thread. How did you do?

hey.. so an we talk about the exam now?? coz its like the 16th now... :s-smilie:

i put it in a spoiler box jst incase... i duno if tht helps..

Spoiler

Reply 701

silent ninja

19

This k business is hilarious.

Reply 702

Adjective

12

The only reason I was happy with leaving 45.3 as my final answer was because of the stuff I remembered from GCSE Stats (and from playing around with the numeric integration on my graphing calculator), i.e. that ~95% of data that is normally distributed lies between 2 standard deviations of the mean (between 46 and 54 kg) and that ~99.8% of the data lies between 3 standard deviations of the mean (between 44 and 56kg)... though I realise this is only a rough check since it leaves masses right up past 56kg uncounted... but it's still enough for me to know I was in the right area.

Reply 703

silent ninja

19

You didn't notice that huge 33 page thread above?

Reply 704

so what was the answer :confused:

Reply 705

yh i got like 45.36 or something like that but a few of my mates got something like 48... so im not sure... did you use 2.32 anywhere in your method??

Reply 706

yep but i made the obvious mistake of not reading the question so i got like 54.xxxx
but i did use that 2.xx value. in the formula book it gave the correct version to 4 decimal places when you were looking up what gives u 0.01
i think ive lost like 2 marks for that mistake :mad:

Reply 707

in the mark scheme they probably have like a certain range from like 45.3 - 45.5 and that would probably get you the last answer mark... im thinking (and hoping - fingers crossed)

Reply 708

i got really confused using the correct version and it started to give me a headache actually.. so i just used it from the normal tables lol

Reply 709

yep.....but i no i got it wrong oh so mad...the jan 2008 paper was so much easier
i think i messed that up
looking back ive lost 10 marks

Reply 710

cat_2002_12

essence_of_rose

in the mark scheme they probably have like a certain range from like 45.3 - 45.5 and that would probably get you the last answer mark... im thinking (and hoping - fingers crossed)

Yeah thats what I'm hoping too

Reply 711

essence_of_rose

i got really confused using the correct version and it started to give me a headache actually.. so i just used it from the normal tables lol

lol on the RHS of the page it gave u the like correct things...but ull only loose 1 mark max i am sure

Reply 712

er... noo lol.. 33 pages?? woah.. all i did was type in the search box for 's1 2008 may'.... and i found this thread.. im gona try n find that 33 page thread

Reply 713

jameselder232

RandomLiverpool

yep but i made the obvious mistake of not reading the question so i got like 54.xxxx
but i did use that 2.xx value. in the formula book it gave the correct version to 4 decimal places when you were looking up what gives u 0.01
i think ive lost like 2 marks for that mistake :mad:

I did this but realised that as 99% weighed more, it must be below the mean, so i did (50(mean)- (54.xxxx-50 (mean)) to get the value which 99.9% exceeded, since its a normal distribution, left side of mean=right side.

Also i forgot about the three combinations for the last part :frown:

I got the 4.16x10^-3 or whatever though so should get a few marks for that :smile:

It is definately x3 not ^3 by the way.

Reply 714

oh btw what was the question about the 'explanotory value/variable' ive never like come across that in my revision... but i just put down the pitch (v).. but i had no idea :s

Reply 715

silent ninja

19

Strange, because you posted in there several minutes ago :p:

Reply 716

cat_2002_12

Explanatory variable (another way of writing independent variable) was T. Temperature was the variable you changed. Pitch was what you measured (dependent variable)

Reply 717

ohhhhhhh.... damn it!!! lol

Reply 718

jameselder232

Explanatory is the one controlled by man. Dependant is the one that man is measuring. you just had to know that really to answer that question, and i did as i saw it in a text book in my revision, although i always used different names for them.

Reply 719