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The regression model y = 1 x 1 + 2 x 2 + 3 x 3 + 4 x 4 + is to be fitted.How

The regression model y = 1x1 + 2x2 + 3x3 + 4x4 + is to be fitted.How many of the s must differ from zero in order to claim that the model is useful for prediction?

Zero

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