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June 22nd 2005 - The Official S2 Discussion Thread! watch

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    So how did you find the exam?

    Post your answers / questions you had problems with here!

    i thought the exam was pretty straightforward, with question 7 being kinda tricky towards the end.

    i'll post more indepth answers when ppl in the UK are done with the exams too!
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    so glad that ones over! thought it was ok, all things considering...
    question 1 - was it as easy as i thought or was it complicated?
    question 7 - you had to reverse everything right??? what did everyone get?
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    1: n = 125
    sd = root (2.88)
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    yea thout it was ok 2, question 7 was quite triky and i ended up doin
    the six mark question the long way!!!! took a gud 15mins!!! Also please someone tell me it was negative skew...the median question took agesssss to work out...managed to get X^4 + X^2 = 0.5.... or something along those lines then had to calculate x from that... is that rite i cheked it about 5 times!!!!
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    (Original post by DaKe)
    yea thout it was ok 2, question 7 was quite triky and i ended up doin
    the six mark question the long way!!!! took a gud 15mins!!! Also please someone tell me it was negative skew...the median question took agesssss to work out...managed to get X^4 + X^2 = 0.5.... or something along those lines then had to calculate x from that... is that rite i cheked it about 5 times!!!!
    Median was 1.08, it was negative skew
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    quite easy stuff
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    (Original post by BrendanC)
    Median was 1.08, it was negative skew

    i got the same. but i think 3.s.f is right.
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    argh didnt like that exam at all i kept getting loads of x^3 and x^4 mixed in with just x and random numbers didnt know how to solve. outside the exam room were a load of noizy chavvy shalggy girls screaming and shouting and cackling like witches- got so confused and distracted. Did people reject h0 and get the 1% sig thing to be at 10? i reversed it for calculations so i could use the table but it was tricky thinking around the reversed > and < signs and what the numbers were telling me!
    for 1st q i got n=225 then used that to calcualte the probability in the second part. It confused me at first but i think i got what it was on about. I couldnt do any of the calculate the mode median sweness etc questions because nothing was working out O.o and i made a really stupid mistake with correct y to z for <40 i did x<4 = y<35.5!! not 39.5 argh dunno what i was doing!!

    :bawling: i had such high hopes of this exam as well , i thought s2 was easy before today.
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    what did you all get for question 7??? the two last bits - i got 0.1018 or something, and got 11 for teh number of people (got 9 initally and then did again and got 11) - not sure what is right, if any! - is anyone 100% sure their answer is right? if so what is it?

    cheers

    Phil

    also, for the two randomly selected pages, the error being less than 7 or whatever i got (0.0042)^2 - some people changed the rate by multiplying by two, but i remember it saying two randoply selected paged, so assumedt he events were independent - anyone got a clue what the answer was - was 2 marks for this, but still need then
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    Q7

    0.2 Something don't reject Ho
    10

    should be correct.
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    (Original post by Phil23)
    what did you all get for question 7??? the two last bits - i got 0.1018 or something, and got 11 for teh number of people (got 9 initally and then did again and got 11) - not sure what is right, if any! - is anyone 100% sure their answer is right? if so what is it?

    cheers

    Phil

    also, for the two randomly selected pages, the error being less than 7 or whatever i got (0.0042)^2 - some people changed the rate by multiplying by two, but i remember it saying two randoply selected paged, so assumedt he events were independent - anyone got a clue what the answer was - was 2 marks for this, but still need then

    i know the events were independant put if wouldnt the average still be doubled over too pages, that is what i did doubled λ then looked it up in the tables. as for the 9 or 11 for the last part i got 10 so did my mates, i just presumed this was right cause other people got it as well :p:
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    hmmmm... i ddnt reject H0 cos the value i got was 0.21... which is > 0.05therfore not in Critical region... so do not reject?
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    (Original post by Savioahang)
    Q7

    0.2 Something don't reject Ho
    10

    should be correct.
    o wait actually i didnt reject h0 i kept it it was my mate afterwards trying to convince me that you DID reject h0. lol
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    (Original post by DaKe)
    hmmmm... i ddnt reject H0 cos the value i got was 0.21... which is > 0.05therfore not in Critical region... so do not reject?


    Yeah!!!
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    (Original post by DaKe)
    hmmmm... i ddnt reject H0 cos the value i got was 0.21... which is > 0.05therfore not in Critical region... so do not reject?
    i got 0.2 something *judges how well she did by everyone else* although we could all have just made the same mistakes!
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    For the last question i got x<9.

    or x less or equal to 8
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    Question 6 was evil!!! It just didn't work! Got the median to be 1.08 by trial and improvement!! Aaaargh! Not good!

    For 7 I reversed it and got 9 people.

    Everything else was fine just q6 and maybe q7 were hard.
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    Me too, yay!

    I didn't reject the first part, 20%! It's usually closer than that!
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    How come it was 9?

    I am sure 10 is right... but you guys...?
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    Damn it.

    That was the worst S2 exam I've ever seen.

    I finished questions 1 to 5 in 20 minutes and then got stuck on finding the median and the mode in question 6. I couldn't find the mode because I didn't remember the formula d(f(x))/dx = 0 and I got to 2m^2 + m^4/4 = 2 for the median and couldn't solve it. I lost about 9 marks on that question

    For the last part of question 7 I got 9.
 
 
 
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