Comments on: Mr Brewin – GCSE Stats

By: Mr Brewin

Mr Brewin — Tue, 23 Nov 2010 21:11:59 +0000

Well done! : D

By: amelia

amelia — Tue, 23 Nov 2010 20:54:41 +0000

I did it!!!!

By: amelia

amelia — Tue, 23 Nov 2010 20:27:15 +0000

okay, thanks

By: Mr Brewin

Mr Brewin — Tue, 23 Nov 2010 20:22:04 +0000

You might get a negative gradient (will do if it’s negative correlation) and could get a negative intercept…though unlikely if negative correlation. Come and see me first thing if you can’t get it sorted tonight.

By: amelia

amelia — Tue, 23 Nov 2010 20:12:44 +0000

Yes i have plotted and everything, it is the equation, i did the whole y-x sum, but it doesn’t work out when i attempt to do part d, i keep on ending up with negative numbers

By: Mr Brewin

Mr Brewin — Tue, 23 Nov 2010 19:57:09 +0000

Sorry Amelia – can’t get access to it at the moment. Do you want to explain a bit which part you’re stuck on? Presumably you’ve plotted the scatter diagram, done the mean point and the line of best fit? Is it the equation of the line of best fit?

By: Mr Brewin

Mr Brewin — Tue, 23 Nov 2010 19:39:38 +0000

Hi Amelia – just trying to access the page, sorry, left my t-book at school. Check back in 30 mins if that’s ok! Thanks for asking…

By: amelia

amelia — Tue, 23 Nov 2010 18:32:39 +0000

Hello. Please could you help me on qu.7(c)of the homework. I cant get it to work out correctly. Thankyou

By: Mr Brewin

Mr Brewin — Sat, 13 Nov 2010 12:29:48 +0000

Well done finding that symbol! It means ‘the sum of’ whatever follows it. So Ʃx would mean ‘the sum of the x-values’. Or Ʃx^2 means the sum of the squares of the x values. That help?

By: Nina

Nina — Sat, 13 Nov 2010 10:32:01 +0000

Hi again, I’m just making some notes, and I can’t work out what Ʃ actually means – I know it means ‘the sum of’ but I don’t really get what the book means by this :S