Question: n statistics, the notation XY means summed all the values of the X variable and then multiplied this result times the values of the Y

n statistics, the notation "XY" means summed all the values of the X variable and then multiplied this result times the values of the Y variable. multiplied each pair of the X and Y scores and then summed their values. summed all the values of the X variable, all the values of the Y variable, and then multiplied all of these results. variation of the X and Y variable is multiplied then squared

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