Question: 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?

Sxx= Summation x2 - (summation x)squared divided by "n"

Syy= Summation y2 - (summation y)squared divided by "n"

Sxy= Summation xy- (summation x) squared multiplied by (summation y) divided by "n"

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