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# Edexcel S1 Regression watch

1. when a question ask you to work out b, where in the formula book let
b=Sxy/Sxx

some time the question can have any variable like p t h q etc...
let say a question has Spp, Spt and Stt

we would obviously do b= Spt/S...

how doe we know what goes in the numerator which one goes in there???

i now it a funny question
2. (Original post by TheGoldenRatio)
when a question ask you to work out b, where in the formula book let
b=Sxy/Sxx

some time the question can have any variable like p t h q etc...
let say a question has Spp, Spt and Stt

we would obviously do b= Spt/S...

how doe we know what goes in the numerator which one goes in there???

i now it a funny question
the one with the two different letters as subscripts always and numerators. One with same subscript always denominator
3. (Original post by TheGoldenRatio)
when a question ask you to work out b, where in the formula book let
b=Sxy/Sxx

some time the question can have any variable like p t h q etc...
let say a question has Spp, Spt and Stt

we would obviously do b= Spt/S...

how doe we know what goes in the numerator which one goes in there???

i now it a funny question
oops miss read the spp goes on denominator . take x=p and t=y
4. (Original post by falcon pluse)
the one with the two different letters as subscripts always and numerators. One with same subscript always denominator
could you explain it with S..(something) please
5. got it thanks

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