K What is a residual Explain when a residual is positive negative and zero GILB OA A residual is the difference between the observed y value of a data point and the predicted y value on a regression line for the x coordinate of the data point A residual is positive when the point is above the line negative when it is below the line and zero when the observed y value equals the predicted y value OB A residual is the difference between the observed y value of a data point and the predicted y value on a regression line for the x coordinate of the data point A residual is positive when the point is below the line negative when it is above the line and zero when the observed y value equals the predicted y value OC A residual is the sum of the observed y value of a data point and the predicted y value on a regression line for the x coordinate of the data point A residual is positive when the point is above the line negative when it is below the line and zero when the observed y value equals the predicted y value OD A residual is the sum of the observed y value of a data point and the predicted y value on a regression line for the x coordinate of the data point A residual is positive when the point is below the line negative when it is above the line and zero when the observed y value equals the predicted y value