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Edexcel S3 UK and IAL June 2016 model solutions

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1. (Original post by SharingOBE)
Hi,
I made a terrible error when pooling the binomial question. Given that my following test statistics and conclusions suited my mistake, how many marks would I lose for that?
Thx.
Sounds like you'd lost 2.
2. (Original post by Zacken)
Sounds like you'd lost 2.
Can you tell me the values that were in the binomial question for the observed frequencies please? before pooling or combining
3. (Original post by Zacken)
Hey!

Edexcel S3 UK June 2016 solutions below. IAL ones are coming in the next post by someone else in a bit. I can't upload the actual paper due to copyright violations but if you don't quite remember what a question was, leave a reply below and I'll jog your memory.

Was a easier than usual paper, I think. Wordy questions might lose people a mark or two. High boundaries.

Edit: Q6(c) should read 3 degrees of freedom instead of 2 and a corresponding chi-squared value of 11.345, the conclusion still stands.
in the last part of Q6 i combined my table and had my H_0 and H_1 written down with correct lamda and i did v=5-2=3 how many do i get out of 6?
4. Hi,

In q4 the egg question i forgot to times my answer by 2 how many marks would i lose?

Also, for the confidence intervals in the last question i did 19.5/100 and 1.5/100 and times my answers by 100 at the end, would i lose any marks?
5. Did the values for r and s still come out the same for using 1.78 instead of 1.80 at 2 decimal places?
6. (Original post by physicsmaths)
in the last part of Q6 i combined my table and had my H_0 and H_1 written down with correct lamda and i did v=5-2=3 how many do i get out of 6?
If you read the edit in my first post, you'll see that that's correct and I was wrong.
7. (Original post by FireBLue97)
Can you tell me the values that were in the binomial question for the observed frequencies please? before pooling or combining
6, 25, 12, 6, 1
8. (Original post by Interest_123)
Hi,

In q4 the egg question i forgot to times my answer by 2 how many marks would i lose?
1 or 2.

Also, for the confidence intervals in the last question i did 19.5/100 and 1.5/100 and times my answers by 100 at the end, would i lose any marks?
Don't think so.
9. (Original post by Zacken)
1 or 2.

Don't think so.
Thank you v much
10. (Original post by Chrisdav)
Did the values for r and s still come out the same for using 1.78 instead of 1.80 at 2 decimal places?
Can't check right now, but I doubt it heavily.
11. I think I found the mean from the sample (xf)/f and when I used it came to the same values as the expected? Thanks anyway for the answers.
12. (Original post by Zacken)
If you read the edit in my first post, you'll see that that's correct and I was wrong.
naa, i know i only did upto there that is all i did, i know you wrote it wrong im saying how many do i lose since i had to move on i only combined my expected stuff and wrote hypothesis and degrees of freedom.
13. (Original post by Chrisdav)
I think I found the mean from the sample (xf)/f and when I used it came to the same values as the expected? Thanks anyway for the answers.
That's what you were meant to do, that's how you get 1.8.

(Original post by physicsmaths)
naa, i know i only did upto there that is all i did, i know you wrote it wrong im saying how many do i lose since i had to move on i only combined my expected stuff and wrote hypothesis and degrees of freedom.
Ah, I think you'll lose 2 marks?
14. (Original post by Zacken)
That's what you were meant to do, that's how you get 1.8.

Ah, I think you'll lose 2 marks?
nice, so lose 2 marks for vaue of X^2 cv and end statement? decent not bad at all, also just before there i got lambda=1.799 since i used the first expected value. that is still correct right? only problem is the expected values they had given were not accurate hence everyone who did my way lost accuracy in lamda but to 2 dp we get the same r and s values.
15. (Original post by physicsmaths)
nice, so lose 2 marks for vaue of X^2 cv and end statement? decent not bad at all, also just before there i got lambda=1.799 since i used the first expected value. that is still correct right? only problem is the expected values they had given were not accurate hence everyone who did my way lost accuracy in lamda but to 2 dp we get the same r and s values.
You might lose 3 marks, not sure if I remember the markscheme properly. I think assume 3 marks lost to be safe.

You might drop a mark for the lost accuracy, not sure.

All in all, sounds like you did well enough to make your offer tbh!
16. Really Zacken? What the original numbers for 4>= for the columns before the were merged in your answers on 6(b).
17. (Original post by Zacken)
You might lose 3 marks, not sure if I remember the markscheme properly. I think assume 3 marks lost to be safe.

You might drop a mark for the lost accuracy, not sure.

All in all, sounds like you did well enough to make your offer tbh!
lol yeh shud get 70+/100. My way is much smarter tho, it was like a STEP spot.
18. (Original post by Chrisdav)
Really Zacken? What the original numbers for 4>= for the columns before the were merged in your answers on 6(b).
0, 1, 2, 3, 4, 5 or more.

5, 40, 31, 18, 6, 0
19. Much appreciated.
20. In the question 7(a) I changed all the values from % just to normal decimal ones but didn't change it back to %, how many marks will I lose?

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