Obs xy (x-xbar) (y-ybar) (x-xbar)*(y-ybar) | (x-xbar)² (y-ybar)² 1 0 1 1 1 3 1 3 4 2 2 5 2 4 7 8. 7 6. > 4 1 1 3. 4. 6. 2. 6. 2.

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A: It is an important part of statistics. It is widely used.

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