How do I find Sxx using my calculator?? Watch

gum1941
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So I've got a Casio fx-991ES calculator, I know how to work out pmcc, a and b for the regression line (y = a+ bx),

Does anyone know if its possible to work out Sxx, Sxy and Syy using the calculator?

Thanks.
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DeadEnd_96
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Yes you can but you have to use the formulas to work out Sxx, Syy and Sxy.
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Obiejess
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It's just Ex^2-n(Ex/n)^2
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gum1941
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(Original post by DeadEnd_96)
Yes you can but you have to use the formulas to work out Sxx, Syy and Sxy.
Oh so there's no button to work out Sxx and Syy for me?
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the bear
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you can look up σx

then square it

then multiply by n
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DeadEnd_96
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nope there is no button to work them out. You have to use the formulas. Its on page 120 in Edexcel S1 textbook.

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username457532
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(Original post by gum1941)
Oh so there's no button to work out Sxx and Syy for me?
Your calculator isn't designed to do everything for you.
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DeadEnd_96
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Attached files
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gum1941
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(Original post by DeadEnd_96)
LOL yeah I know the formulae, but thanks anyways
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