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An analyst examines the effect that various variables have on crop yield. He estimates the following model: y = ? 0 + ? 1 x

An analyst examines the effect that various variables have on crop yield.

He estimates the following model:y = ?0+ ?1x1+ ?2x2+ ?3x3+ ?

Whereyis the average yield in bushels per acre,x1is the amount of summer rainfall,x2is the average daily use in machine hours of tractors on the farm, andx3is the amount of fertilizer used per acre. A portion of the regression results is shown in the accompanying table.

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