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# Edexcel S1 - 15th June, 2016 [Exam Discussion] watch

1. (Original post by Willandy123)
Yo guys, do we have to learn all the proofing for all the equations in S1, if so, anyones got all the proofs?

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You dont need to learn the proofs for any of the formulas.

2. For the June 15 paper on question 3 where it asks to determine whether its statically independent I did what Alwaus gets me the marks in past papers but for this one they wanted something different and I don't get it.
My failed solution ^
Attached Images

3. (Original post by Kadak)
When they say give an interpretation of b ,what is usually meant ?
b is the gradient, so for every one unit increase in x, the y increases (if b is positive) or decreases (in b is negative) by the value of b
4. HEY AGAIN can someone pls help me with june 2013(R) question 5 d) and e).. I really don't understand the theory behind it - Here's the paper's link: http://qualifications.pearson.com/co...e_20130517.pdf
5. For Question 7b,why did the mark scheme use 0.67 instead of 0.75 ?
https://1a388b28f5ce9318f837a64962fc...%20Edexcel.pdf
6. (Original post by Siddhart1998)

For the June 15 paper on question 3 where it asks to determine whether its statically independent I did what Alwaus gets me the marks in past papers but for this one they wanted something different and I don't get it.
My failed solution ^
I always do:
If they are independent then P(B|C) = P(B)
P(B) = 20/80 = 0.25
P(B|C) = (4+3)/28 = 0.25
Since P(B) = P(B|C) the events are independent
7. (Original post by wenogk)
HEY AGAIN can someone pls help me with june 2013(R) question 5 d) and e).. I really don't understand the theory behind it - Here's the paper's link: http://qualifications.pearson.com/co...e_20130517.pdf
5d) The value is unchanged
Reason is Sxx = Sum(xbar - x)^2
so x = 6
xbar is sum of x divided by number of items
sum of x was 60 (divided by 10 gives xbar of 6)
Add 6 (turner has 6 characters) and we have 66/11 (one new item)
so x bar is STILL 6.
Since x is also 6 there is nothing to add to Sxx, so it still equals 28
8. (Original post by Kadak)
For Question 7b,why did the mark scheme use 0.67 instead of 0.75 ?
https://1a388b28f5ce9318f837a64962fc...%20Edexcel.pdf
They did use 0.75.

P(X<Q3) = 0.75. Then look at the table to see what value of Z gives 0.75 - you'll find that it's 0.67.

So, 0.67 = q3-mean/s.d and then solve for q3.
9. Hi,
If the probability is for example P([CUB]), what do the square brackets mean?
10. Do you guys think we will get an easy or hard paper tomorrow ?
11. (Original post by rose1234)
Hi,
If the probability is for example P([CUB]), what do the square brackets mean?
Probability of C or B occurring so you add P(B) +P(C).
U upside down means =ADD(multiply the probabilities).
I think the square brackets represent the order in which you prioritise the brackets e.g.do the ones in the square before you do the normal one.
12. Does anyone else find June 2015 IAl impossible of just me?
13. (Original post by Siddhart1998)

For the June 15 paper on question 3 where it asks to determine whether its statically independent I did what Alwaus gets me the marks in past papers but for this one they wanted something different and I don't get it.
My failed solution ^
the method you used is right. 0.0875=7/80
however how did you get 0.25 for P(b/\c) (maybe venn diagram was wrong). P(b/\c) is also 7/80 (4+3/80) so as they're equal, they're statistically independant
14. (Original post by Kadak)
Do you guys think we will get an easy or hard paper tomorrow ?
I bricking it for tmo, as im assuming it's gonna be harder. I've done every PP over the last week chronologically (2005-2015) and my overall mark has slightly decreased as I came to the more recent ones. They're getting wordier and expecting to APPLY our knowledge of current topics more frequently, on styles of questions we've just never seen before.

C1 & C2 (2016) provided as evidence for this, as I'm sure many found these papers slightly harder than previous PPs, and i think S1 will generally follow this trend. Hopefully it won't be harder but all we can do now is pray for the best!
15. guys any important points and tips to write in questions where dey ask us to compare to events specially in the case of 2 box plots
16. In question 2f of the 2016 IAL paper, why is the probability passing 1/2 instead of 75%? Is it just common sense that chance of passing is 1/2?
17. Attachment 549863549865Could someone possibly explain to me how to get this answer I'm lost..
Attached Images

18. best way to revise probability and normal distribution?
19. http://www.thestudentroom.co.uk/show....php?t=4164799

20. (Original post by arrow_h)
Attachment 549863549865Could someone possibly explain to me how to get this answer I'm lost..

Prob a- wakes before 6:30
Prob b- goes for a run

draw a VENN DIAGRAM:
from reading the question we can see-
P(A)= 0.7
P(B) 0.35
P(A'/\B')= 0.22 (outside of two circles)

remember: P(AuB)= overall probability within two circles
so P(AuB)= 1 (total proability)- 0.22 (probability lying OUTSIDE of circles)
=0.78

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