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# Arsey's S1 Edexcel Summer 2013 Model Solutions BOTH PAPERS Watch

1. (Original post by jehearo)
Shouldn't the outlier be 14?

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I put 2 crosses at the front :O
I dont know if it is right?
2. I'm gonna ask this again haha. I put the PROBABILITIES in the Venn diagram instead of the actual number of workers, would I get any marks? The probabilities were all correct btw.
3. (Original post by Freddy-Francis)
for 1 f. to find the difference in temperature rite?

I put my final answer as -7.5. will i still get the 2marks ?
The mark scheme usually accepts ± answer.

so ±7.5 should be accepted, providing you wrote showed correct method.
4. What happens if I put two solutions, one was correct, but I crossed it out? Method marks only?

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5. I spent ages on first question and rushed the end questions
6. (Original post by GCSE-help)
I'm gonna ask this again haha. I put the PROBABILITIES in the Venn diagram instead of the actual number of workers, would I get any marks? The probabilities were all correct btw.
On the Jan 2012 S1 paper, for a Venn diagram question, they say the following in the mark scheme:

"All values/100 or equivalent fractions award accuracy marks."

Obviously in the case of this question, it would be 33/200 etc.

so you should get all the marks, unless they decide to be strict and wipe of the accuracy marks.
7. (Original post by Freddy-Francis)
I put 2 crosses at the front :O
I dont know if it is right?
There were only 2 outliers, 14 and 90.
8. (Original post by Graham981)
There were only 2 outliers, 14 and 90.
Yeh two outliers

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9. Then I am expecting 50 - 56,
If i am lucky a B rite?
10. (Original post by Graham981)
There were only 2 outliers, 14 and 90.
so i put 14 and 1 more extra with 90.
Does that mean i get 4 marks? i did everything else rite on the box plot?
11. Hi,

Yeah, with harsh marking on myself I gave myself 69 out of 75.

Couple of Questions:

If on the Venn Diagram Question, I didn't write the 0s (just left the bits with nothing blank), but I put all the other probabilities, how many marks would I get out of 4 for that question?

For the product moment coefficient thing if I said 'p =' rather than 'r =' would I still get the marks?

For the comparison of box plots, I said a few things. I said the median of the boys is greater than the girls, I gave numbers, I said the interquartile range was greater for the boys, I said what they were. I said they both have a positive skew. Would I get 2 out of 2 for this question?

For the box plot question, I put my whiskers on my highest value that wasn't an outlier and my lowest value that wasn't an outlier, this is an accepted variation isn't it?

Finally, this is a bit of a shot in the dark, but would they accept for that question which asked 'Why is the mean and s.d. not suitable', my answer, which said
"Not suitable because the mid-point has to be used which is not as accurate as interpolation - the standard deviation would also not be accurate due to the innaccurate mean".

Thanks!
12. For the venn diagram I put the right values in but I left only Bblank instead of writing 0. Will i lose a mark for this.

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13. (Original post by EmmaiPhone)
Anyone help? If I used 1490000 and 22400 instead of 1491222.222 and 22408.888 to work out the product moment correlation coefficient and the regression line - how many marks have I thrown away?
I believe it is perfectly fine, because say you used the original values you would get :

r=(-22,408.888…)/√(1,491,222.2…x 371.56) = -0.951994

If you round this value to 3s.f., you get -0.952

which would be the same answer you get if you used the values rounded to 3s.f.
14. (Original post by must try harder.)

Got a bit stuck on the Venn diagram question. I figured that if the event B was that an employee takes the bus to work, B would be a subset of each three circles

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I did this, would that have definitely been wrong?
Did the three circles as mutually exclusive.
15. Would this gain any marks for the Venn Diagram question? Anyone else get this?
Thanks
16. (Original post by hellyesa)
Hi,

Yeah, with harsh marking on myself I gave myself 69 out of 75.

Couple of Questions:

If on the Venn Diagram Question, I didn't write the 0s (just left the bits with nothing blank), but I put all the other probabilities, how many marks would I get out of 4 for that question?

For the product moment coefficient thing if I said 'p =' rather than 'r =' would I still get the marks?

For the comparison of box plots, I said a few things. I said the median of the boys is greater than the girls, I gave numbers, I said the interquartile range was greater for the boys, I said what they were. I said they both have a positive skew. Would I get 2 out of 2 for this question?

For the box plot question, I put my whiskers on my highest value that wasn't an outlier and my lowest value that wasn't an outlier, this is an accepted variation isn't it?

Finally, this is a bit of a shot in the dark, but would they accept for that question which asked 'Why is the mean and s.d. not suitable', my answer, which said
"Not suitable because the mid-point has to be used which is not as accurate as interpolation - the standard deviation would also not be accurate due to the innaccurate mean".

Thanks!
You are likely to lose at least 1 mark for leaving blanks rather than writing "0".

for writing p= instead of r=, it is likely to depend on how strict they mark you, but since there is no other variable abbreviated "p", you should get the marks.

For the box plot question, I wrote the same 1st two points, and I think you should get 2/2 unless you wrote something which contradicts your statements.

However, I don't think you are likely to get the question regarding unsuitability of mean & stan. dev., due to incorrect use of the term interpolation, since interpolation & extrapolation regards to reliability of estimates, rather than accuracy.
17. (Original post by Olly2304)
Would this gain any marks for the Venn Diagram question? Anyone else get this?
Thanks
I did this too! Haha, i thought i was the only one. Surely it is still right?
18. Thanks for this!
Lost a few silly marks but nothing too bad. I agree about the timing though, it was the slowest i've ever completed an S1 paper before!
19. (Original post by Undisclosed 15)
For the venn diagram I put the right values in but I left only Bblank instead of writing 0. Will i lose a mark for this.

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You are likely to, yes.
20. (Original post by Freddy-Francis)
so i put 14 and 1 more extra with 90.
Does that mean i get 4 marks? i did everything else rite on the box plot?
Assuming you marked the outliers in the correct place, then yes, 4/4.

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Updated: December 2, 2013
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