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Winnie wanted to determine the nature of the relationship between sales (y) and the X billboards used (x). She collected data for four days as

Winnie wanted to determine the nature of the relationship between sales (y) and the X billboards used (x). She collected data for four days as shown below. x 2 2 3 3 y 10 20 30 40 Calculate the coefficient of determination given that the model estimate is Y = -25 + 20x

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