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Edexcel S3 - Wednesday 25th May AM 2016

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Original post by Armpits
For the last one did you rearrange 0.5/2rootn = 1.9/2 ?


Something like that. I used 1.6449
Original post by SB0073
Those all ring a bell Mean was like 26.45 right?
they asked for 3sf i think
And 1.95 is for the z value i think, something like (2)/root(12.2/35+10.1/42) something
Original post by economicss
For question 2, did people get 4.604 is less than 4.605 for the conclusion?


Can't remember figures but definitely rejected the null hypothesis, ie there was an association

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[QUOTE="anndz3007;65150399"]
Original post by SB0073
Those all ring a bell Mean was like 26.45 right?
they asked for 3sf i think
And 1.95 is for the z value i think, something like (2)/root(12.2/35+10.1/42) something


Oh yeah, it was 1.95
Original post by Armpits
Did you rearrange 0.5/2rootn = 1.9/2 ?


Using the width formula I think I did something like 2x1.6449.2/rootn<2x0.5

So 2x1.6449/0.5<root n

So Root n>6.5797
n>43.2911...
therefore n=44
Vote on S3 and compare with last year

http://www.thestudentroom.co.uk/showthread.php?t=4117063
Can anyone remember all the hypothesis tests? I think I got

influenza: association
Mean was greater
Can't remember the binomial and poisson!
Original post by Nikhilm
Can anyone remember all the hypothesis tests? I think I got

influenza: association
Mean was greater
Can't remember the binomial and poisson!


I got that too For Binomial I think B(4,0.3) is suitable
For Poisson i think it wasn't suitable if i remember correctly
Reply 1208
Avatar for TLDM
TLDM
6
Original post by Nikhilm
Can anyone remember all the hypothesis tests? I think I got

influenza: association
Mean was greater
Can't remember the binomial and poisson!


My binomial was suitable, but my Poisson wasn't.
Original post by Nikhilm
Can anyone remember all the hypothesis tests? I think I got

influenza: association
Mean was greater
Can't remember the binomial and poisson!


Binomial is suitable and poisson is not suitable
Original post by anndz3007
2, 5.61
3 rs= 0.75
4, a) .7784 b).0107
5 1.95
Unbias mean 26.5, variance 12.7
The mean of the poisson is something like 1.8 and chi square for binomial is something 14.xx ?
Last question n=44
As long as i remember this is what i did


Yeh got most of them.


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Original post by SB0073
Using the width formula I think I did something like 2x1.6449.2/rootn<2x0.5

So 2x1.6449/0.5<root n

So Root n>6.5797
n>43.2911...
therefore n=44


Right.

I did P(z< 0.5/2rootn) >= 0.95

lool instead of 1.6449 for z, I put 0.95 for z, and somehow decided to put the corresponding probability 0.8289 for z , which I equated to 0.5/2rootn

Not sure what I was smoking...
Original post by anndz3007
Binomial is suitable and poisson is not suitable


Could you give the contexts of the binomial and poisson plz? As in what the question was about
got question 1 wrong :/
Original post by Armpits
Right.

I did P(z< 0.5/2rootn) >= 0.95

lool instead of 1.6449 for z, I put 0.95 for z, and somehow decided to put the corresponding probability 0.8289 for z , which I equated to 0.5/2rootn

Not sure what I was smoking...

In all honesty I wasnt sure if what I was doing is right! I just thought back to Rostas coffee beans question which was a really similar Q a few years ago.
Original post by anndz3007
2, 5.61
3 rs= 0.75
4, a) .7784 b).0107
5 1.95
Unbias mean 26.5, variance 12.7
The mean of the poisson is something like 1.8 and chi square for binomial is something 14.xx ?
Last question n=44
As long as i remember this is what i did


What's 5.61?
Original post by Nikhilm
Could you give the contexts of the binomial and poisson plz? As in what the question was about


Binomial wá something about no of suicases from 0 to 4 B(4,0.3)
Poisson was something abiut passengers in 100 5 minute intervals
Reply 1217
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TLDM
6
Original post by Nikhilm
Could you give the contexts of the binomial and poisson plz? As in what the question was about


The airport one.
Original post by Armpits
What's 5.61?


Chi square for the doctor question ?
Original post by JacobTan
why 44? i got 27. anyone remember what the question was?


I believe near the end you should have got

[br]2ϕ(0.52n)−1=0.9[br]∴ϕ(0.52n)=0.95[br]∴0.52n=1.6449[br]∴n≈43.29[br][br]2 \phi (\frac{0.5}{\frac{2}{\sqrt{n}}}) -1 = 0.9[br]\therefore \phi(\frac{0.5}{\frac{2}{\sqrt{n}}}) = 0.95[br]\therefore \frac{0.5}{\frac{2}{\sqrt{n}}} = 1.6449[br]\therefore n \approx 43.29[br]
min n is 44

does anyone else agree?
(edited 7 years ago)

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