Scatter plot correlation coefficient

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kidsasd987

how can I interpret the condition "if sum of (xi-x_bar)^2(yj-y_bar)^2=0 when i=/=j?"

why does this make the line linear?

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Jack Davies

Since each term is squared, it is positive definite. So for the entire sum to be equal to 0, each individual term has to be 0. Does that help?

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