OCR MATHS PURE + STATS A-LEVEL official thread Watch

UmamiPiñapple
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How are u guys feeling about tomorrow?

This thread can be used as an unofficial markscheme after the exam too
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UmamiPiñapple
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Personally I’m hoping there’s not too much probability and a fat hypothesis test please
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lionike123
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For median is it n+1/2 and is Lower quartile 1/4(n+1)
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UmamiPiñapple
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How did everyone find it
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CALLUM2412
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1239 for the last question (value of n) P(x<n)

I think the Parametric hit x axis at around 8sqrt3/3 potentially iirc.

The u = 6x^2 + x I think I got 1/2 and -1/3

The standard deviation of 67-77g with mean 72g I think the question said, I believe I got 7.41

What did people get for the pollution hypothesis test?
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LexiV
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Yeah I got the exact same as u except for the last one, I can’t remember what I got for that
(Original post by CALLUM2412)
1239 for the last question (value of n) P(x<n)

I think the Parametric hit x axis at around 8sqrt3/3 potentially iirc.

The u = 6x^2 + x I think I got 1/2 and -1/3

The standard deviation of 67-77g with mean 72g I think the question said, I believe I got 7.41

What did people get for the pollution hypothesis test?
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TM37
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Centre of circle was (3,-4) and radius 2
Volume of cylinder was like 5.0something
Hypothesis test was not significant
0.06something was p bag had less than 530g
5/11 was the p(a 2 | T=7)
44/225 was p(T=7)
Parametric hit axis at 8sqrt3/3
1 + 1.5x -9/8 x^2 + 27/16 x^3
Median of data was 65, IQR was 15, mean was 69 (hehe), standard deviation was 10.5
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NihilisticBear
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Did anyone get 5.20 for the volume?
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LexiV
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What r value did u get
(Original post by NihilisticBear)
Did anyone get 5.20 for the volume?
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NihilisticBear
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For the normal hypothesis test about pollution, I think it was two-tailed and I got the result was insignificant
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OFEY
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Yes!
(Original post by NihilisticBear)
Did anyone get 5.20 for the volume?
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NihilisticBear
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4th root of 32/6 or something like that
(Original post by LexiV)
What r value did u get
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sarunthan87
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Just realised I stupidly forgot to sub. back the value of r into the formula for volume!!!
But I found Stats less time pressured and easier than Pure... which was weird as that never happens for me
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CALLUM2412
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What was the method/working for the proof?
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NihilisticBear
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For the one about the binomial expansion, did anyone get x=34, which wasn't even in the range of x values? I carried out the expansion using x=34 and got something completely different to sqrt(103), I looked at the question for so long wondering whether I was wrong or whether we were supposed to prove the expansion wasn't valid? Did anyone get the same?
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LexiV
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YESS I got the exact same I was so confused
(Original post by NihilisticBear)
For the one about the binomial expansion, did anyone get x=34, which wasn't even in the range of x values? I carried out the expansion using x=34 and got something completely different to sqrt(103), I looked at the question for so long wondering whether I was wrong or whether we were supposed to prove the expansion wasn't valid? Did anyone get the same?
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CALLUM2412
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(Original post by NihilisticBear)
For the one about the binomial expansion, did anyone get x=34, which wasn't even in the range of x values? I carried out the expansion using x=34 and got something completely different to sqrt(103), I looked at the question for so long wondering whether I was wrong or whether we were supposed to prove the expansion wasn't valid? Did anyone get the same?
Yes! Just assumed my method was wrong
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NihilisticBear
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I did proof by contradiction, assume that it was prime, then I said, let n=2k, where k greater than 2, then I put 2k into the equation 2^n - 1, which simplified to (2^k+1)(2^k-1), which was a product of 2 numbers, so not prime, so basically I said by contradiction, that her statement was correct
(Original post by CALLUM2412)
What was the method/working for the proof?
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Adiej12
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What you had to do it use 0.01 so then it was (1.03)^0.5 then it’s sqrt(103)/10 so just time the answer by 10. I started with 34 and realised it was wrong
(Original post by NihilisticBear)
For the one about the binomial expansion, did anyone get x=34, which wasn't even in the range of x values? I carried out the expansion using x=34 and got something completely different to sqrt(103), I looked at the question for so long wondering whether I was wrong or whether we were supposed to prove the expansion wasn't valid? Did anyone get the same?
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CALLUM2412
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The range value of K for the probability of young people vs old people in said something like 1/6 <= k <= 3
Not sure why again

And why would the data be useful for university students? (1)
And is it reliable? (2)
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