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How do these formula work? S xx= Summation x 2 - (summation x)squared divided by n Syy = Summation y 2 - (summation y)squared divided

How do these formula work?

S_{xx= Summation x}2 - (summation x)squared divided by "n"

Syy_{= Summation y}2 - (summation y)squared divided by "n"

S_{xy= Summation xy}- (summation x) squared multiplied by (summation y) divided by "n"

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