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S1 May 2012 - Post Exam Thread - Paper and Solutions in the FIRST POST

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Reply 40

ellozzy

what do we think the boundaries will be

Reply 41

Imposition

Evidence from a recent study suggest that people who do too much statistics are the most likely to be considered physically repulsive :tongue:

This is surely the most tedious module in mathematics.

I hope my dislike for stats is coming through.

Reply 42

Jammy4410

[QUOTE=Arsey;

would i get the mark for proving train and walk were mutually exclusive instead of bike? (just checking)
Cheers for mark scheme, settles post exam nerves

Reply 43

raheem94

Original post by Arsey

This thread will be locked at somepoint and then unlocked at midnight following the Stats 1 examination. I will upload the paper and my solutions to this post. I will do my best to answer questions about the paper but please try to read the thread first so that I am not answering the same questions lots of times.Here are some links to previous S1 threads, they are worth a read and you will see what the common errors were...S1 Jan 2012 - http://www.thestudentroom.co.uk/showthread.php?t=1865940S1 June 2011 - http://www.thestudentroom.co.uk/showthread.php?t=1619124The second link contains loads of past papers, model answers etcGood luck.

First of all thanks for posting the mark scheme :biggrin:

Can you please clear some of my queries:

I did everything correct except that i forgot(brain fade!) to use interpolation while finding the median in the histogram question. The value of median i got was 25.

I said that it is less than 28.8 so the data is positive skewed, i showed that the mean is greater than median.

In the last part of the histogram question, i said that median will be used because data is skewed.

Will i get full marks for other parts except the median part?

In the last question i got confused in part b and c. I did 2 attempts for part b and 4 attempts for part c. In both parts i got one of those answers which matches with your's, will i get full marks in it?

Please clear my doubts.

What are your grade boundary predictions, i reckon 100UMS will be at less than 75 this time.

(edited 11 years ago)

Reply 44

Jack74

why in 2A) on this paper is the PMCC = 3990/square root of 5606.25*-4244? and not 3990/square root of 5606.25*4244

Reply 45

ArsLongaVitaBrevis

NO!!!!!! Full marks until the last 2 parts of the last question - I read the probability of being fades as 0.5!
Thanks Arsey - If this is the same error, and my probabilities are correct for the figure I read of 0.5 instead of 0.05, how many marks will I lose?

Reply 46

woodhamboyluke

Yes! Only marks it looks like I lost were part d and e for the histogram question, 71/75 hopefully :biggrin:

Reply 47

miss_spell

I wish I could remember what answers I got - jealous of the people who can work it out now!

I'm hoping to have got an A though :smile:

EDIT: Actually after looking at it properly I think I got around 63 - well into an A judging by previous grade boundaries so I'm happy :smile:

(edited 11 years ago)

Reply 48

pjanoo

Original post by ArsLongaVitaBrevis

ME TOO

I read that as 0.5 as well! Soooo mad!!!

Reply 49

tj hughes

Original post by Arsey

Hey Arsey, Nice work!

Are you doing one of these for D1 mark scheme/solutions??

Reply 50

ArsLongaVitaBrevis

Original post by pjanoo

ME TOO

I read that as 0.5 as well! Soooo mad!!!

Oh god it's such a stupid mistake. I thought I was going to get 100 when I got past all the harder questions! Kill me now... How many marks do you think we'll lose?

Reply 51

UWS

My regression line went through the mean but I drew it from the origin, would I lose marks for that?

Reply 52

pjanoo

Original post by ArsLongaVitaBrevis

Oh god it's such a stupid mistake. I thought I was going to get 100 when I got past all the harder questions! Kill me now... How many marks do you think we'll lose?

I'm hoping we'll still get the M marks for method! And just lose the A marks for accuracy, so maybe half the marks? I might be being generous here as I am biased lol

Reply 53

cooldudeman

everyone in the exam hall was like, wtf was up with that histogram question!!!!?!?!?

Reply 54

Casshern1456

Looks like the histogram got many people.

Reply 55

Mr Tough

YESSS! I reckon another 100 unless they are harsh on my wordy answers... :smile:

Reply 56

JakeMachinima

Original post by ellozzy

what do we think the boundaries will be

Gonna be high. 62 for an A I'm thinking.

Reply 57

und

Original post by UWS

My regression line went through the mean but I drew it from the origin, would I lose marks for that?

Certainly. I think you'd lost one mark for that.

Reply 58

woodhamboyluke

Original post by koolkid1011

Hey two questions, if anyone can answer i'd appreciate it a lot:

1. For question 4a i gave two examples which were (B n W) and (T n W) . Each one is correct but would i be marked down for giving two? i got the explanation correct btw...

2. For question 5e would i get away by saying that the data is almost symmetrical and therefore it would be appropriate to use the mean? Also for question 5d i said the distribution was symmetrical for the same reasons above, again would i get the marks?

Thank you :smile:

Wondering this for 4a as well, I mis-understood two events as two examples, hopefully it won't be a problem as they were both right...