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

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Reply 720

arrow_h

Just to make sure, when drawing regression lines, the point goes through the mean, correct?

Reply 721

Mr T Pities You

Original post by ChilliLemon

Do we need to know about explanatory variables????

Sort of. Remember it's an X-planatory variable, so on x-axis (independent variable)
The other is the response variable.
The only question I recall on exams is "which is the response variable?" Nothing high level.

Reply 722

Mali_

If n is an odd number then you just use the value in the number position or if it's a decimal round up to next position value.

However, if n is an even number then you have to find the midpoint between the 2 values, e.g. If n is 30, Q2 is the sum of the 15th and 16th value divided by 2.

Hope this helps.

Reply 723

Mr T Pities You

Original post by not_lucas1

So if the Q is a whole number you add 0.5 and use the mean of the values its between? and if its a rational number you round it and use that specific number?

Yes, but always round UP, not just round. That matters for Q1.

Reply 724

SANTR

Original post by LewisClothier

Not quite sure if you understand how the tables work, I think you should try figure out a way of using them that works for you, maybe a bit late now :tongue:

Ok, if you were given a random probability and there are probabilities on the table, which are close to your probability value. Do you choose the Z value of the one which is the closest?

Reply 725

ChilliLemon

Original post by Mr T Pities You

Thanks very helpful!!

Reply 726

username2029515

Can anyone summarise and clarify which reasonings we need to know? For example why are mathamatical models useful.

Reply 727

Mr T Pities You

Original post by HK4

Can anyone summarise and clarify which reasonings we need to know? For example why are mathamatical models useful.

Chapter 1 of your textbook probably!

Reply 728

username2250433

when doing normal distribution when do you use this table, my teacher only did like 1 example with it

Capture.PNG24.8KB

Reply 729

mollie1711

Original post by Mr T Pities You

Yep, and if you get a decimal round up and use that value.

Thankyou!!

Reply 730

ChilliLemon

What is the hardest S1 Paper i can do before i sleep???????????

Reply 731

Mr T Pities You

Original post by SANTR

Ok, if you were given a random probability and there are probabilities on the table, which are close to your probability value. Do you choose the Z value of the one which is the closest?

Provided it's not on the 'small table', yes. It usually doesn't matter which z value you pick (the one above or below)

Reply 732

arrow_h

Original post by Mr T Pities You

Provided it's not on the 'small table', yes. It usually doesn't matter which z value you pick (the one above or below)

When drawing lines of regression, do we draw it through the mean value?

Reply 733

Mr T Pities You

Original post by not_lucas1

when doing normal distribution when do you use this table, my teacher only did like 1 example with it

When given a probability above a z value (and you are trying to find the z value)
Look at the values for p though - there are only a few 'nice' probabilities in there.
If it's an ugly probability that you're given, you'll have to find it in the big table.
Key advice for any normal distribution question; draw a diagram!

Reply 734

username2029515

Original post by not_lucas1

when doing normal distribution when do you use this table, my teacher only did like 1 example with it

When P(Z>z) = p so the shaded area is to the right of Z and you do not need to subtract from 1.

Reply 735

tazza ma razza

Original post by Zacken

Hopefully not. :tongue:

huh - a guy said you firmed warwick? oh hang on - if you got warwick and imperial; i guess you got oxbridge as well - in which case yh, hopefully i don't see you in warwick :wink:

Reply 736

Mr T Pities You

Original post by arrow_h

When drawing lines of regression, do we draw it through the mean value?

Yes, (xbar, ybar) is on the regression line.

Reply 737

TheRandomGenius

Original post by ChilliLemon

What is the hardest S1 Paper i can do before i sleep???????????

June 2014 (R) had the most tricky 'standard' questions; hate that paper. Jan 16 IAL wasn't a standard paper imo and tested understanding quite well; loved doing it.

I'd do both if I were you.

Reply 738

Mr T Pities You

Original post by mollie1711

Thankyou!!

No problem, good luck tomorrow.

Reply 739

Zacken

Original post by tazza ma razza

huh - a guy said you firmed warwick? oh hang on - if you got warwick and imperial; i guess you got oxbridge as well - in which case yh, hopefully i don't see you in warwick :wink:

Nah, I insured Warwick over Imperial. i.e: I had Cambridge, Warwick, Imperial and UCL and to choose a (firm, insurance) ordered pair, I chose (firm, insurance) = (Cambridge, Warwick). I'll probably end up at Warwick at the rate I'm going. :tongue:

Good luck for your exam.

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

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