S2 Edexcel Thursday 24th May AM - PAPER & SOLUTIONS IN FIRST POST

1
a. 0.4
b. 0.5841
c. 0.3422

2.

a. X=<7 X>=18
b. 0.0432

3. 0.0201 < 0.05 reject null hypotheis

4.

a.1. 0.0286
2. 0.8088
B. 0.0432

1b I got 0.3412

Reply 141

justreadthebooks

Original post by TheAdrianoo789

I'm sure you'll get a good few marks for that, cos you wrote out all possibilities and all probabilites, you just didnt apply it to the range.

yeh like i wrote out a beautifully perfect distribution for the WRONG FRIGGING THING ....all adding nicely up to 1.... so how many marks will i have lost? also, was it out of 6 or 8?

argh stats is so annoying to interpret sometimes.

Reply 142

sweetascandy

18

I'm gunna forget my answers soon :cry2:

Reply 143

master_blaster66

17

Original post by godknows

Wtf there was a question 8 ... Ok someone post the paper before I die from a myocardial infraction O_O

yep there were 8 questions..it was about the water drinking

Reply 144

XxAmxX

Original post by justreadthebooks

yeh like i wrote out a beautifully perfect distribution for the WRONG FRIGGING THING ....all adding nicely up to 1.... so how many marks will i have lost? also, was it out of 6 or 8?

argh stats is so annoying to interpret sometimes.

out of 6

Reply 145

David_Skiller

Original post by godknows

Wtf there was a question 8 ... Ok someone post the paper before I die from a myocardial infraction O_O

Reply 146

tangkykiet

Original post by UWS

I used poisson distribution for the last question.. So that's 8 marks lost, right?

dont lost hope yet !! no one know it yet

Reply 147

justreadthebooks

on the other hand, i am liking the look of those answers so far :biggrin:

i'd quite like to know what you got for the pdf -> cdf......that wasn't a fun question.

Reply 148

agent87

Guys can you check ur answers

1
a) 0.4
b) 0.5841
c) 0.3422

2.

a) X=<7 X>=18
b) 0.0432

3) 0.0201 < 0.05 reject null hypotheis

4)
a) 1) 0.0286
2) 0.8088
B) 0.0432

Reply 149

JordanS94

16

Original post by justreadthebooks

yeh like i wrote out a beautifully perfect distribution for the WRONG FRIGGING THING ....all adding nicely up to 1.... so how many marks will i have lost? also, was it out of 6 or 8?

argh stats is so annoying to interpret sometimes.

6 be thankful :smile:

Reply 150

master_blaster66

17

Original post by pritpals

i think grade boundries be around 62 - 63 loads of ***** at my school found it easy

that would be too low, they probably be 65ish

Reply 151

godknows

Original post by master_blaster66

yep there were 8 questions..it was about the water drinking

OMGGGGG I THINK I MISSED OUT A WHOLE QUESTION .. How many marks was it

Reply 152

aaronbenham

Can someone post the paper before I die of heat stroke in bed here. SO HOT (and the nerves now arent helping)

Reply 153

tohare

Did anyone else do this as an AS module not having done s1. I thought the test was horrible! Whats the general feeling?

Reply 154

tizza1394

1

I'm guessing we don't have a mark scheme yet because no-one can do the last question to post one xD

Reply 155

Troll the Trolls

Original post by justreadthebooks

yeh like i wrote out a beautifully perfect distribution for the WRONG FRIGGING THING ....all adding nicely up to 1.... so how many marks will i have lost? also, was it out of 6 or 8?

argh stats is so annoying to interpret sometimes.

SAME! i did it for the totals, 3,4,5 and 6 haha, it was worded horrile, i thought they wer the range of values the numbers could be. I remember thinking, they cant possibly mean the range between 2's and 1's

Reply 156

js12

I typed in all my answers in stat mode in my calculator. Not sure about the question numbers and some of them were wordy/algebraic so I don't have those.

0.4
0.5841
0.3412
x<7 x>18
0.0432
n is large, p is small
0.0201
0.0286
0.8088
0.2277 (i think this is wrong from what others have said)
0.1093
4
2
0.8
0.633
0.3175
0.6825
-
-
0.933
0.2508
0.9536
35

Reply 157

sweetascandy

18

Wasn't the question after 0.8088 (question 2b im assuming) supposed to be 0.8088 squared = 0.6542?
ANyone agree?

Reply 158

TheAdrianoo789

Original post by justreadthebooks

yeh like i wrote out a beautifully perfect distribution for the WRONG FRIGGING THING ....all adding nicely up to 1.... so how many marks will i have lost? also, was it out of 6 or 8?

argh stats is so annoying to interpret sometimes.

I can't say for sure... I dno. It was 6 I think, and I dno how the marks are allocated, but I think you may get a few cos you did some of the steps.