Question: A linear model is found to be y = 3.5x + 6. At a value of x = 4, the equation yields y = 20.

A linear model is found to be y = 3.5x + 6. At a value of x = 4, the equation yields y = 20. However, the actual data value for x =4 is found to be y = 22.3. The residual at x = 20 is

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