Statistics S1B 17/05/2013 Thread

Reply 320

Joe899

Original post by andyt8765

Think they'll be lower than that. I'd say about 59ish for an A.

I agree..at most 60 for an A I guess, especially if they keep it similar to May 2012 grade boundaries.. 55 for an A!

Reply 321

SherlockHolmes

13

For the regression line, does anyone remember the values used to calculate a and b?

Reply 322

maggiehodgson

14

Reply 323

002

10

Original post by maggiehodgson

Legend!

Reply 324

maggiehodgson

14

Reply 325

Son234

In each of the 10 bags :biggrin:

That defo means to the power of 10 phew :smile:

This was posted from The Student Room's iPhone/iPad App

Reply 326

WheezyT

2

Mother of sweet lord that SXX and SYY question. I have no idea what I was doing there.... And they gave SYY at the top and I didn't realise!!!
Probability wasn't nice....

Anyone noticed that they're straying away from past papers? Like on core 2 they had some random questions and here something completely different!

Hope we all did well. I think the grade boundaries will be brought down because of that stupid questions.

Posted from TSR Mobile

Reply 327

RoseBrilliante

7

Original post by WheezyT

Mother of sweet lord that SXX and SYY question. I have no idea what I was doing there.... And they gave SYY at the top and I didn't realise!!!
Probability wasn't nice....

Anyone noticed that they're straying away from past papers? Like on core 2 they had some random questions and here something completely different!

Hope we all did well. I think the grade boundaries will be brought down because of that stupid questions.

Posted from TSR Mobile

Literally was going to give up on the Sxx and Syy question, put my head on the table and go to sleep but then I remembered the formula booklet... :P I came back to that second part of that question at the end and managed to figure it out, but I didn't get the bit where you had to calculate the least equation regression line. I subbed the values of xbar and ybar into a random formula I found but that's pretty much it :/

(edited 10 years ago)

Reply 328

maggiehodgson

14

Yep. I missed the Syy too despite having used it earlier. READ THE QUESTION NOT JUST THE NUMBERS is what I'm shouting at myself.

Reply 329

WheezyT

2

Me too man. Had about 10 minutes to spare and flopped it fo show!!!!! Oh well

Posted from TSR Mobile

Reply 330

Gotzz

13

I think it went well :smile:

Reply 331

Son234

This is my exact answers in the exam for the last two 4 marker questions

Is that realistically 8marks?

This was posted from The Student Room's iPhone/iPad App

(edited 10 years ago)

ImageUploadedByStudent Room1368807753.586178.jpg82.7KB

Reply 332

bgfuqj2

Question 1aii. Wouldn't SD stay the same?

Reply 333

Gotzz

13

Original post by Leery24

What did people do for the last questions?
And what did you put for the 4 mark justify the equation weight one?

Posted from TSR Mobile

I spoke about the fact that the product moment correlation coefficient showed a very strong positive correlation, that 'a' was close to zero and that 'b' was 1, which meant that for every 1 kg increase in the y weight, the x weight also increased by 1 kg.
Hence the estimated weight is likely to be accurate.

Reply 334

wsaqed

Original post by Son234

This is my exact answers in the exam for the last two 4 marker questions

Is that realistically 8marks?

This was posted from The Student Room's iPhone/iPad App

That's exactly what I got :smile:

Reply 335

002

10

Original post by Son234

This is my exact answers in the exam for the last two 4 marker questions

Is that realistically 8marks?

This was posted from The Student Room's iPhone/iPad App

Yippee! I got these answers too!