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

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Reply 900

Exavior

Original post by lfcrules

How the hell did I get 0'13???????????

I dont know xD it was like P(D)XP(?)=intersecion as the variables were independent

Reply 901

Siddhart1998

What did people get for the median?
And what did people put down for the written bits?
Probabaly a little bit easier than last year...61 for A?

It's 34x0.5=17cm bro

Original post by Alexelele

For the histogram question did anyone else get 17 I think, It was basically the frequency of the class

yes I got that!

Reply 904

username738914

Original post by iMacJack

e(r) = 0.45, second bit first part 0.475, second but second part 0.375

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Yep

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Reply 905

gayasfxckname

That was one of the worst Statistics papers. I couldn't even answer the last two questions

Reply 906

zandneger

My answers:
1.
Can't remember part a)
b) wiggles were the response variable as they are what changes based on the distance
c) the regression line I got was 0.722+0.014d
d) I subbed in 350 and got w=5.69
my answer was reliable because it was within the range of data

2.
a) 2p+Q=0.5
b) Q=0.15 P=0.175
c) 2.2 something like that?
d) E(R) =0.45
e) Sara's chance = 0.475 Rebecca's chance = 0.375

3.I don't remember much about this question other than the PMCC being around -0.7 and the extra data causing the PMCC to increase because it showed a positive correlation.

4.
a) 0
b) t=0.03
c) u=0.22
d) 0.45 and 15/37
e) 33 customers ordered dinner

5.
a) median baby weight was 3.47
b) s.d was 0.689
c) showed mean was 3.43
d) used that guys normal distribution to get that 0.2546 babies were under 3kg
e) showed that in the table only 9 babies were under 3kg whereas using his distribution I got that 12 babies were under 3kg hence he is wrong to assume the distribution

6.
a) 6.68% of men took over 300 minutes
b) the speedy chap needed to run his marathon in under 206 minutes
c) the probability was 0.18/0.5 (0.36)

Reply 907

HasanRaza1

Anyone else mess up calculating the standard deviations?

Reply 908

Exavior

Original post by SalazarSlytherin

Lowers SD because the average spread is less

Ahh i put lowers standard deviatoon because the value of fx^2/fx decreases and mean stays the same
1 mark??

Reply 909

Cave Felem

Original post by Batman_Stark

Number of customers at the end of that venn diagram question---did anyone get 48?

I got something like 48.83 which rounded up to 49 I think... Possibly 47.83 which rounded to 48.

Reply 910

DaVinciGirl

How did you find the exam overall?

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Reply 911

username1625799

Grade boundaries predictions anyone?

Reply 912

HasanRaza1

Also how were you meant to calculate Syy bruh

Reply 913

LivKennedy

Original post by aynnihsan

I couldn't get the answer for the rebecca and sarah winning thing 😭😭😭

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me neither wtf were you meant to do!

Reply 914

hanhan19

Original post by Exavior

How did the value of the the extra baby affect the mean and thr standard deviation.

Was that dude right to model around the normal distribution?

I said the mean wouldn't change because the baby's weight was the same as the mean weight so t shouldn't change.

I just assumed that the standard deviation would change

Reply 915

ICantFindMyName

Original post by SpoodleDoodle

I can't believe how easy that was😅
But, it was only easy if you knew the concepts!! Last question was very tricky but I think I pulled it off!!

For those who haven't entered the exam hall yet make sure to revise normal distribution before you go in!!

And probability lol

And discrete random variables!!

This exams was all about
Chapters 5, 8, 9, 7 with knowledge you should've known from chaps 1-3!!

How was it for you guys ?!!