Edexcel S1 A Level Maths

Are questions such as the following...

"Give two reasons to justify the use of statistical models."

... still in the specification? :eek:

Unfortunately, yes :frown:

Reply 361

Satanel

1

Original post by usycool1

Unfortunately, yes :frown:

Oh dear, my teacher must have completely missed it.

Is it just, like, "to adapt to real life situations"? I don't really know. Help! :tongue:

Reply 362

May-o2q

14

Hi guys, does anyone know if we need to remember the formula for discrete uniform distribution? Because we could use normal discrete distribution formula to find the answer too. But is there any past paper that said we MUST to use discrete uniforms formula? :/

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Reply 363

Air1337

Original post by May-o2q

Hi guys, does anyone know if we need to remember the formula for discrete uniform distribution? Because we could use normal discrete distribution formula to find the answer too. But is there any past paper that said we MUST to use discrete uniforms formula? :/

Posted from TSR Mobile

You can use random distribution methods for discrete uniform distribution too. However, we might be asked a question where there are way too many numbers and it would take you 20 minutes to calculate all of it so we would have to use n+1/2 or (n+1)(n-1)/12.

Reply 364

Fortitude

16

Original post by Satanel

Oh dear, my teacher must have completely missed it.

Is it just, like, "to adapt to real life situations"? I don't really know. Help! :tongue:

Do you have the textbook? It's on page 2. Basically they allow predictions to be made on real life situations, they improve our understanding of those real life probs, simplify a complex situation.... :smile:

Reply 365

May-o2q

14

Original post by Air1337

You can use random distribution methods for discrete uniform distribution too. However, we might be asked a question where there are way too many numbers and it would take you 20 minutes to calculate all of it so we would have to use n+1/2 or (n+1)(n-1)/12.

Oh alright, thx u!

Posted from TSR Mobile

Reply 366

Satanel

1

Original post by Fortitude

Do you have the textbook? It's on page 2. Basically they allow predictions to be made on real life situations, they improve our understanding of those real life probs, simplify a complex situation.... :smile:

Aah, okay. Thanks! :cool:

Reply 367

spiderman2019a

11

What is and what is not affected by coding?
Regression Line
Standard Deviation
Mean?

Reply 368

usycool1

19

Original post by librastar28

What is and what is not affected by coding?
Regression Line

Is affected by coding.

Standard Deviation

Only multiplying/dividing it affects is.

Mean?

Is affected. :yep:

Also:

The PMCC is not affected by coding. :nah:

Reply 369

username963570

21

Original post by hello.cupcake

Okay okay, this is much more helpful! How do you work out the union? I don't get it :frown:

like once I have the initial probabilities, the rest is eàsy!

Posted from TSR Mobile

it tells you that 40% don't read newspapers at all - so the union is everybody that reads A newspaper of some description ( in this case quality or tabloid as they are the only two newspapers given ) hence 1 - 0.40 = 0.60 which is the union :smile:

Reply 370

username963570

21

Original post by usycool1

Is affected by coding.

Only multiplying/dividing it affects is.

Is affected. :yep:

Also:

The PMCC is not affected by coding. :nah:

whats the PMCC :colondollar:

Reply 371

usycool1

19

Original post by Satanel

Oh dear, my teacher must have completely missed it.

Is it just, like, "to adapt to real life situations"? I don't really know. Help! :tongue:

Have a look at Arsey's notes: http://www.thestudentroom.co.uk/showthread.php?t=1619124&p=31101338#post31101338 (take a look at the first one).

Reply 372

usycool1

19

Original post by Fas

whats the PMCC :colondollar:

The Product Moment Correlation Coefficient. :smile:

Reply 373

SheriB

9

Seriously feeling like I'm gonna fail this exam :frown:

got a u on the January 2013 paper

Reply 374

simonb451

If someone has done June 2012- how do you do question 5 a) when you dont have the FD?

Reply 375

spiderman2019a

11

Original post by usycool1

Is affected by coding.

Only multiplying/dividing it affects is.

Is affected. :yep:

Also:

The PMCC is not affected by coding. :nah:

Thx

Reply 376

Satanel

1

Original post by usycool1

Have a look at Arsey's notes: http://www.thestudentroom.co.uk/showthread.php?t=1619124&p=31101338#post31101338 (take a look at the first one).

Ooh, that's very helpful! Thank you. :smile:

Reply 377

username963570

21

Original post by usycool1

The Product Moment Correlation Coefficient. :smile:

oh yeah ! sorry haha i was having my daily blonde moment :tongue:

Reply 378

username963570

21

Original post by simonb451

If someone has done June 2012- how do you do question 5 a) when you dont have the FD?

add up all the squares covered by the bars - divide 450 ( i think its that ) by the number of squares to get the number of cars per square - then its very easy from then onwards :smile:

Reply 379