Edexcel AS Mathematics: Statistics S1 6683 01 - 13 June 2018 [Exam Discussion]

So adding in coding doesn’t affect Sxx but for you’d have to times by 1000 squared, where as Swx you would only need to times Sxx by 1000

The exam is on wednesdayyy

So pmcc and Sxx things aren’t affected by adding or subtracting, but they are affected by multiplication,

And when two events, A and B, are independant P(AnB) = P(A) x P(B)

Pretty much the only things that you need to remember really

What is the change was in the number of values, for example n was increased by 1? What happens to Sxx then?

Well if you were too look at the equation for Sxx and those similar then the average and sum of squares would change weirdly in an unpredictable way like the Sxx doesn’t change proportionately like it would with coding I think, Edexcel wouldn’t include a change of n in a question I’m sure of it so not to worry

anyone for d(ii)? i really cant get the markscheme
its IAL jan18 ..TIA

https://youtu.be/Vk0wDqI0EtQ
Check this link ..... it’ll explain

thanks a lot

Histograms

So pmcc and Sxx things aren’t affected by adding or subtracting, but they are affected by multiplication,

And when two events, A and B, are independant P(AnB) = P(A) x P(B)

Pretty much the only things that you need to remember really

can anyone explain this whole times by 1000 squared vs times by 1000 with sxx and syy and coding stuff like that came up in 2017 s1? Thank you

Pmcc isn't affected by multiplication either. I think your confusing it with standard deviation coding

Lol they came up last year. Try tree diagrams they didn't come up last year. Pract discrete random and normal distribution. They tend to have a lot of hard questions on those topics. Also make sure you know the modeling method by heart. It could ask for all the steps in a 4 Mark question