Edexcel s1 June 2016 unofficial mark scheme watch
- 16-06-2016 14:45
- 16-06-2016 15:32
Could someone please just remind me how they worked out the answers to part f) in Question 2? I might have got the right answer but I'm not sure, I can remember the method I used but not the exact answers. CheersLast edited by speed1✈️✈️; 16-06-2016 at 15:32. Reason: Clarification
- 16-06-2016 15:49
Q3(e) What effect will 14mm rain and 70hrs sunshine have on the PMCC?
As the PMCC is -0.753.. this suggests moderate linear negative correlation, i.e. the more rain the less sunshine. As both values (14mm and 70 hrs) are above the mean (10.85mm and 58hrs) this would suggest as one increases so does the other! Therefore this is contrary to the negative correlation and will therefore increase it, bringing it closer to zero.
That's what I thought anyway
- 16-06-2016 16:41
I got 233 instead of 206 anyone know where i went wrong
- 16-06-2016 17:27
[QUOTE=civ1;65839343]I got 233 instead of 206 anyone know where i went wrong[/QUOTE
I did this at first too, you worked out the Z value for x<240= 80% and then did 1- the Z value but should just make the z value negative as it isn't a probability. Hope this helps it's quite hard to explain.Tagged:Last edited by SashaWicks; 16-06-2016 at 17:33.
- 16-06-2016 17:37
[QUOTE=SashaWicks;65841315](Original post by civ1)
I got 233 instead of 206 anyone know where i went wrong[/QUOTE
I did this at first too, you worked out the Z value for x<240= 80% and then did 1- the Z value but should just make the z value negative as it isn't a probability. Hope this helps it's quite hard to explain.
- 16-06-2016 17:49
- 16-06-2016 18:32
- 16-06-2016 19:03
do any of you guys know why 'physics and maths tutor' has not put up the model answers for this exam?
- 16-06-2016 19:19
It's so frustrating that not a single person can post model answers with the paper online. I want to know what I got now, not in 2 months
- 16-06-2016 20:22
(Original post by studentsixth)
- 16-06-2016 20:30
Why is it though? Like if anything they just get you worked up about your grade until result's day which puts you off your A2 and relaxing over the summer. I think the mark schemes come out in a month anyway (I think)
(Original post by thesporkthief)
- 16-06-2016 20:30
For 6b, I worked out the top 20% as the 20% with the longest times (I'm an idiot) because I misread the question. Do you think I'll lose all three marks or scrape one for doing the right method, just with the wrong values? I need all the marks I can get tbh
(Original post by speed1✈️✈️)
- 16-06-2016 20:42
I disagree, last year I knew (for a fact) that I was going get a high A in AS Maths (roughly 88-91ums) by looking at Arsey's mark schemes, and I was bang on correct - I got 266 at AS. I just want to know what mark I got in S1 (how low or high the A is) so that I can know what I need to score in C3/C4 to get an A overall (and I cba for both)
- 16-06-2016 20:55
- 16-06-2016 20:55
(Original post by TSRPAV)
- 16-06-2016 22:19
i could do it again if i saw the question but i can gaaruntee it was 206.something=206 minutes, this was the one where you got given that he want to be in the top 20% so do PI(z)=0.20, look up 0.20 on the small (z) table which takes values from the positive side which is 0.8416 on a normal distribution cure but then change it to negative as its on the negative side of the symmetry (as we took the values from the table as positive) then do -0.8416=x-(the given mean)/(given standard deviation)
mean was 240 so s.d was 40 which gives the 206 , i got 206.4 any idea why and should it still be full marks got -0.84 for z value
(Original post by glad-he-ate-her)
- 16-06-2016 22:28
w=0.721 + 0.0142d
5.691 response was wiggle
E (r) was 0.45 rebecca and sarah winning 0.475 0.375
3. 2.35 -133.9 -0.754
4.0 0.03 0.22 0.45 0.405 33 was number of diners
Feel free to correct or give answers to non numerical questions(Original post by logicmaryam)
Was told to post my answers on a separate thread so it doesn't get lost in the other thread.
I've got my answers here:
Predicting 58 ish is an A and not much lower because it wasn't that bad of a paper. Loads of people thought it was OK or slightly harder. Theory questions threw me off a bit though.
Q1. 11 total i think
a) was Sdd or something (3)
b) wiggles is the response variable as it changes depending distance (1)
c) r = 0.722 + 0.014d
d) d= 350 sub in so w = 5.6 ish?
Q2 Sarah one
a) equation is 2p + q = 0.5
b) a= 0.175 b= 0.15
d) E(R) = 0.45?
e) Sarah wins = 0.475 Rebeccawins= 0.375
Q3 with frequencies?
a) heigh of bar and width igot something like 34cm and 1cm?
b) show that Syy is … (1) didn’tdo this right lol
e) What were the other questions?
Q4 Hotel one
b) t =0.03
c) u = 0.22
d) 0.45 and 15/37
e) diners 16? Some people say 33
a) median 3.47
b) SD = 0.689?
c) mean proof 3.43
d) Probability baby wasunder 3kg something like 0.2546
e) explain the use ofthe model? (2)I said that althoughthe range chosen was appropriate as mean was 3.43 for both and SD was close tothe calculated one, there is negative skew as median>mean so not good to use this model as mean and SD are affected by skew.
f) effect of adding baby weight of 3.43 on (3)
i) mean – I said staysthe same because I sneakily calculated it , because the frequency becomes 51and value is within range or something
ii) SD change "Others said it stayed thesame, but I wrote that it decreases, because now the average distance from themean is slightly less (as n has increased by 1 but deviance hasn't changed)".
a) 0.0668 men took over 300 min to run
b) needs to run below 206.33 minutes to be in 20% of people who finish first
d) the mew one0.18/0.5 = 0.36 (3)
Let me know what I'm missing and I've done wrong as well as the marks for each if you remember(Original post by veldt127)
Ok, I managed to get all my answers stored in my calculator at the end, this is what I got. Not 100% sure on all of them, but we can compare.
Question 1Spoiler:Question 2Showa. Show that
b. W - can't remember reasoning
d. 0.0772 + 0.0142d
e. i. 5.69
ii. Reliable as the data was interpolated; it was within the rangeSpoiler:Question 3Showa. 2p + q = 0.5
b. q = 0.15
c. p = 0.175
f. i. 0.475
ii. 0.375Spoiler:Question 4Showa. 2.35
b. Show that
c. -133.9 - possibly -131.9
e. Increase - I tried using the variables from the new week and recalculating r, and it was higher than the original. I said because the values were both higher than the means; I'm not sure at all on this one.
Spoiler:Question 5Showa. 0
b. t = 0.03
c. u = 0.22
d. i. 0.45
e. 33 people have dinner (40*0.18) + (37*(15/37))Spoiler:Question 6Showa. Width 0.5, Height 17
b. 3.47 (median)
c. i. Show that
ii. Standard deviation = 0.680 - possibly 0.689
d. P(W<3) = 0.2546
e. No - the mean is not equal to the median suggesting asymmetrical skew18% of babies were less than 3kg, but her model predicted 25.46%
f. i. Mean remains the same as the new value is the mean
note: mean might decrease as it adds a value to the 3-3.5 group.
ii. The standard deviation decreases as the variance decreases with a new value close to the meanSpoiler:Showa. 0.0668
b. 206 - The lowest 20% of times were the fastest 20% of runners.
c. 0.36(Original post by KloppOClock)
nice, add some spoilers to each questions.
also, itd be a cool idea if you found out the marks of each question and put a strawpoll asking how many marks you got, that way we could guess grade boundaries a lot easier.(Original post by Apolexian)
dont agree with 3a
i think it should be w=0.5 from comparing class width
area of given bar =4
so area of this bar =0.5x17=8.5
h=8.5/0.5=17(Original post by SANTR)
Just out of interest how did you reach the answer for 2(e). What did you have to do to the given Probability Distribution table?(Original post by veldt127)
Sorry, why do I need to spoiler answers? If someone's on this thread they'll want to see answers right? I'm new to this so sorry if there's another reason
I found the reciprocal of each score, then multiplied by the probability. Have to say I wasn't sure on that one.
- 16-06-2016 23:01
- 16-06-2016 23:05