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

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Jan 15 ial

AN EXAMPLE OF CODING

A ninth year is added to the data set. In this year the price of the bottle of milk
is 46 pence and the price of a loaf of bread is 175 pence.
(e) Without further calculation, state whether the value of the product moment correlation
coefficient will increase, decrease or stay the same when all nine years are used.
Give a reason for your answer.

I just did this question, in the data, the price for bread is the same BUT the value of bread increases so it will change as it doesn't follow a correlation anymore

Reply 681

SANTR

Original post by not_lucas1

Haven't had enough time to revise this, i messed up my revision schedule spending the majority of my time on physics and computing which dont even count this year... :/

You'll be fine. Just make sure to memorise the formulas which aren't given.

Reply 682

username2250433

Original post by hogree

That question is not actually coding, that's adding a new value to the Data Set. Since it is further from the Regression Line, the PMCC Decreases.

Original post by Mr T Pities You

This question is not on coding!

He/She was a bit misleading when they put example on coding aight :/

Any predictions?

Original post by sgill23

In discrete random variables if it asks for F(3.5) and the X is between 3 and 4. Which would you use

Remember that F is cumulative probability, so you'll add all probabilities up to and including the one for X=3

(edited 7 years ago)

Reply 685

username1533709

Jan 2015 IAL Q2 part f,why is it (0.50 by 0.25 by 0.25)3 rather than (0.75 by 0.25 by 0.25)3 ?

https://drive.google.com/file/d/0B8iKfLNIO4P4OXpSdUR0bmNkMEU/view

Reply 686

Mr T Pities You

Original post by Kadak

Jan 2015 IAL Q2 part f,why is it (0.50 by 0.25 by 0.25)3 rather than (0.75 by 0.25 by 0.25)3 ?

https://drive.google.com/file/d/0B8iKfLNIO4P4OXpSdUR0bmNkMEU/view

You need the other one to be a pass and not a merit. Your 0.75 would include merits and passes so you just want the 0.5 (ie a pass but not a merit)

Reply 687

sgill23

Original post by Mr T Pities You

Remember that F is cumulative probability, so you'll add all probabilities up to and including the one for X=3

So you don't include the X=4
You basically round the 3.5 down and add up all values like X= 1,2 and 3

Reply 688

Mr T Pities You

Original post by sgill23

So you don't include the X=4
You basically round the 3.5 down and add up all values like X= 1,2 and 3

Yep, even if it was F(3.9998) you would round down and add up the ones up to 3.

(edited 7 years ago)

Reply 689

Kevin De Bruyne

Original post by Kadak

Jan 2015 IAL Q2 part f,why is it (0.50 by 0.25 by 0.25)3 rather than (0.75 by 0.25 by 0.25)3 ?

https://drive.google.com/file/d/0B8iKfLNIO4P4OXpSdUR0bmNkMEU/view