Edexcel S4 - Friday 24th June 2016 AM

I actually had a thought - How do you we do power and size tests with a normal distribution? Have a feeling this is gonna screw me tomorrow

Reply 121

Euclidean

11

Original post by tazza ma razza

I actually had a thought - How do you we do power and size tests with a normal distribution? Have a feeling this is gonna screw me tomorrow

You'd do it in terms of the phi (cumulative distribution) function for the normal distribution. With quite a few inequalities :tongue:

\displaystyle \Phi(Z) = \Phi\left(\dfrac{X - \mu}{\sigma}\right)

I doubt they'd expect it

Reply 122

tazza ma razza

19

Original post by Euclidean

You'd do it in terms of the phi (cumulative distribution) function for the normal distribution. With quite a few inequalities :tongue:

\displaystyle \Phi(Z) = \Phi\left(\dfrac{X - \mu}{\sigma}\right)

I doubt they'd expect it

OK - would you use the percentage points for the critical region? Or like the method used in S2?

Reply 123

Euclidean

11

Original post by tazza ma razza

OK - would you use the percentage points for the critical region? Or like the method used in S2?

Percentage points (or whatever the second 'nice' table is called! :tongue:

)

Reply 124

130398

3

Original post by tazza ma razza

apart from june 11, what is a hard paper?

I think grade boundaries will be:

100 - 75
90 - 69
80 - 64

June 2013 R maybe 2015?

Reply 125

tazza ma razza

19

Original post by 130398

June 2013 R maybe 2015?

cool just did 2015 - got 65 (got the last 8 marks wrong and then made another 2 marks of rounding errors)

Boundary wise tho, seems about right doesn't it?

Reply 126

electrifeye

2

Original post by tazza ma razza

I actually had a thought - How do you we do power and size tests with a normal distribution? Have a feeling this is gonna screw me tomorrow

Question 7 of June 2013 R uses type II error with normal. I'm currently looking through the mark scheme trying to work out what the heck is going on.

Reply 127

tazza ma razza

19

Original post by electrifeye

Question 7 of June 2013 R uses type II error with normal. I'm currently looking through the mark scheme trying to work out what the heck is going on.

awesome - i will do that paper after the current one im doing

Reply 128

tazza ma razza

19

can someone link the june 13r paper? I can't open the pdf from the website!

Reply 129

Euclidean

11

The F tables have values for v_1 and v_2 at infinity, do we use these if our v values are very large?

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Reply 130

electrifeye

2

Original post by tazza ma razza

can someone link the june 13r paper? I can't open the pdf from the website!

Find all the papers here: http://www.physicsandmathstutor.com/a-level-maths-papers/s4-edexcel/

Original post by Euclidean

The F tables have values for v_1 and v_2 at infinity, do we use these if our v values are very large?

I think that's what they're for, not sure why else they'd be there

Reply 131

tazza ma razza

19

providing they dont ask an aids qn on ch1 like a batty intergration with a pdf i think we are good.

Hoping for minimum 75%

Reply 132

coolguy123456

8

Original post by tazza ma razza

providing they dont ask an aids qn on ch1 like a batty intergration with a pdf i think we are good.

Hoping for minimum 75%

I agree, that's pretty much the only tricky part to a paper.

Reply 133

ragreener1

1

Original post by tazza ma razza

providing they dont ask an aids qn on ch1 like a batty intergration with a pdf i think we are good.

Hoping for minimum 75%

That cracked me up 😂😂

In all seriousness though every paper is the same pretty much they never ask anything new. I'm hoping I can get 90% and bring up my FP2

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Reply 134

tazza ma razza

19

Original post by ragreener1

That cracked me up 😂😂

In all seriousness though every paper is the same pretty much they never ask anything new. I'm hoping I can get 90% and bring up my FP2

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power and size etc is a breeze - so is estimating etc however the 7 marks where it all comes from the pdf is gonna tear me a new one i can just tell looool

C4 as well first is just gonna piss on the parade as well

Reply 135

ragreener1

1

Original post by tazza ma razza

power and size etc is a breeze - so is estimating etc however the 7 marks where it all comes from the pdf is gonna tear me a new one i can just tell looool

C4 as well first is just gonna piss on the parade as well

Yeah that's true, in isolation on my own for three hours inbetween :frown:

Reply 136

tazza ma razza

19

Original post by ragreener1

Yeah that's true, in isolation on my own for three hours inbetween :frown:

yuo must be doing ial? i have c4 at 9 and then s4 at 10:45

Reply 137

ragreener1

1

Original post by tazza ma razza

yuo must be doing ial? i have c4 at 9 and then s4 at 10:45

Nope s4 isn't on IAL. I've got C4 at 9:30 then as my sixth form will only do two exam sessions I have to wait supervised by an invigilator until 2pm when I've got S4

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Reply 138

tazza ma razza

19

Original post by ragreener1

Nope s4 isn't on IAL. I've got C4 at 9:30 then as my sixth form will only do two exam sessions I have to wait supervised by an invigilator until 2pm when I've got S4

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LOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOL sorry to hear that man aha

Reply 139

username1162972

18

How did pple find it?
Q1 was so long. What was your guys test statistic?
Q2 was your test statistic 1.511?
There was at algebra this which was lovely
I had n>1 iff n^2+2n>3n giving the best estimator.

Edexcel S4 - Friday 24th June 2016 AM

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