Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
 You are Here: Home >< Maths

# Official Edexcel S3 thread Wednesday 20 May 2015 Morning [6691] watch

1. For the second part of b I added the U1s to get (4/5)U1 - (U2/5 etc)
2. (Original post by Navo D.)
Stated hypothesis
Mu lies within the given CI
For a 5% sig level (two tailed)
Did the same thing. At least that's an extra 3 marks

Posted from TSR Mobile
3. (Original post by Navo D.)
Stated hypothesis
Mu lies within the given CI
For a 5% sig level (two tailed)
It's 5% in each tail but wouldn't you say 10% for the overall significance level?
4. (Original post by xKay)
Pls tell me this is the answer
It should be. You get same mean and variance as in C so answer same
5. (Original post by 13 1 20 8 42)
It's 5% in each tail but wouldn't you say 10% for the overall significance level?
Yeah I suppose you're right maybe I made a mistake then :P (I did mention 10% overall I think)
6. But the question says to find the ACTUAL probability
7. (Original post by xyzmaster)
It should be. You get same mean and variance as in C so answer same
Part d is already tell you that it is NOT the same answer as 0.181
8. (Original post by xKay)
But the question says to find the ACTUAL probability
You'd end up finding p(z>root5/6. ) which was same as I'm c therefore actual was 0.1814 and to three sf 0.181
9. Question 5 was a wipe out
Nice paper apart from that
Couldn't do b
Got 0.304 or something for d

Posted from TSR Mobile
10. (Original post by xyzmaster)
You'd end up finding p(z>root5/6. ) which was same as I'm c therefore actual was 0.1814 and to three sf 0.181
How sure are you?
11. (Original post by bobo19966)
Part d is already tell you that it is NOT the same answer as 0.181
Why not ?
12. (Original post by Mutleybm1996)
Question 5 was a wipe out
Nice paper apart from that

Posted from TSR Mobile
Are you kidding?
13. (Original post by xyzmaster)
You'd end up finding p(z>root5/6. ) which was same as I'm c therefore actual was 0.1814 and to three sf 0.181
but p(z>root5/6) was the probability in the part before was it not?
14. Not claiming I'm right or anything but to those who're saying the last part of 5 is the same as the part right before that;

Why would it be 6 marks for the same thing?
Why would they tell us that 0.181 isn't the actual probability
15. the last part of question 5 is definitely the hardest question there has ever been
16. (Original post by xKay)
How sure are you?
Pretty sure
17. (Original post by Navo D.)
Stated hypothesis
Mu lies within the given CI
For a 5% sig level (two tailed)
Isnt it 10% sig level 5% each tail
18. (Original post by Navo D.)
Not claiming I'm right or anything but to those who're saying the last part of 5 is the same as the part right before that;

Why would it be 6 marks for the same thing?
Why would they tell us that 0.181 isn't the actual probability
Part c used two independent samples. This part used only one sample that's why the wanted us to prove it
19. Not sure my application/final answer was right
But I think the confusion on the last part of 5 was the expectation algebra we use is generally for independent variables
U1 and U bar are not independent because U bar contains U1
So you have to sum up the U1s; it is incorrect to say that the Variance is Var(U1) + Var(Ubar)
20. (Original post by xyzmaster)
Why not ?
The part d is asking why the model of part c (0.181) cannot be modelled the last part of q5

As the part c is independent variable but however any normal distribution may not independent

Reply
Submit reply
Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: May 24, 2016
Today on TSR

### Four things top students are doing

Over the Easter break

Poll
Useful resources

## Make your revision easier

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.