Ocr mei statistics 1 exam thread (24/05/13)

Q1: http://www.mei.org.uk/files/papers/2011_June_s1.pdf

Original post by jo7777

Guys how do you find the minimum and maximum possible values of the midrange of a histogram?
Please help! :smile:

0+3000/2 = 1500
and 1000+4000/2 = 2500 init

Reply 61

tryingtolearn95

Can someone please help me regarding vertical line graphs... I have attached a pic of how I draw mine. Is that okay? Or do I have to make them chunkier to get the marks for mei S1? If that makes sense8) please help :smile:

ImageUploadedByStudent Room1369324820.712910.jpg

Reply 62

Original post by jo7777

the easiest one is (sum of x^2) - (n x mean^2)
divided by n-1
ALL SQUARED

I used that one on a question I just did, and the mark scheme said it was wrong, I'm so confused! :s-smilie:

Reply 63

SonamH

Original post by tryingtolearn95

Can someone please help me regarding vertical line graphs... I have attached a pic of how I draw mine. Is that okay? Or do I have to make them chunkier to get the marks for mei S1? If that makes sense8) please help :smile:

That looks fine :yy:

Reply 64

Original post by Mo_maths

0+3000/2 = 1500
and 1000+4000/2 = 2500 init

Ahh thanks :biggrin:

Reply 65

Original post by zangorou

I used that one on a question I just did, and the mark scheme said it was wrong, I'm so confused! :s-smilie:

You maybe put the numbers in wrong
What's the question and I'll see if I can help :smile:

Reply 66

Original post by zangorou

I used that one on a question I just did, and the mark scheme said it was wrong, I'm so confused! :s-smilie:

It's not all squared, it's all square rooted! If that wasn't the error then check your values in the calculator again.

Reply 67

Original post by jo7777

You maybe put the numbers in wrong
What's the question and I'll see if I can help :smile:

Q2 part i

http://integralmaths.org/resources/file.php/25/papers/S1/2005_Jan.pdf

Thanks :smile:

Reply 68

SonamH

Original post by zangorou

I used that one on a question I just did, and the mark scheme said it was wrong, I'm so confused! :s-smilie:

These are the formulas and when to use which one :smile:

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Reply 69

Original post by SonamH

These are the formulas and when to use which one :smile:

Thank you! :biggrin:

The standard deviation is the same though, I don't understand why it's not working :frown:

Reply 70

If anyone's got any queries or questions that they are stuck on I'm free to help as I've finished my revision now!

Reply 71

Original post by zangorou

Q2 part i

http://integralmaths.org/resources/file.php/25/papers/S1/2005_Jan.pdf

Thanks :smile:

Can't get on there - don't have an account :colondollar:

Reply 72

DarkWillow

I just did another question & the median was n/2!! UGH. I always Guess for n+1/2. I figure that in Cumulative Frequency questions its just n/2.

Reply 73

Mo_maths

Original post by TypoCool

If anyone's got any queries or questions that they are stuck on I'm free to help as I've finished my revision now!

what is the probability that the exam is difficult given the previous exam was easy? LOL :biggrin:

Reply 74

Original post by jo7777

Can't get on there - don't have an account :colondollar:

Reply 75

Original post by Mo_maths

what is the probability that the exam is difficult given the previous exam was easy? LOL :biggrin:

Lol, I'd say that it won't be too difficult! Not much more they can ask, take a look at the 2011 june series which is one of the harder ones, if you master that you' ll get an A for sure!

Reply 76

Original post by DarkWillow

I just did another question & the median was n/2!! UGH. I always Guess for n+1/2. I figure that in Cumulative Frequency questions its just n/2.

It is n+1 with frequency tables
And it is n with cumulative frequencies only

Reply 77

Mo_maths

Original post by TypoCool

Lol, I'd say that it won't be too difficult! Not much more they can ask, take a look at the 2011 june series which is one of the harder ones, if you master that you' ll get an A for sure!

Yeah the old ones don't look that bad but I'm kinda worried that mei may mess up the wording again like in c2 an the other june 2013 papers

Reply 78

Original post by Mo_maths

Yeah the old ones don't look that bad but I'm kinda worried that mei may mess up the wording again like in c2 an the other june 2013 papers

I have noticed that papers are becoming more wordy! But just remember that they want you to do all the things you've done in the mocks just in different situations and circumstances.

Reply 79