30. The coefficient of determination for estimating packaging costs for a local shipper was determined to be 0.74. Which of the following statement is not correct? A) The coefficient of determination is a measure of the percent of variation in the independent variable. B) The coefficient of determination is a measure of how well a least squares equation fits historical data. C) The coefficient of determination can have values between zero and one, with values close to zero suggesting that the equation is not very useful. D) It is possible to have a high coefficient of determination by chance between the independent and dependent variable. 31. An increase in volume within the relevant range will cause: A) Unit fixed costs to increase. B) Unit variable costs to decrease. C) Total fixed costs to stay the same. D) Total variable costs to decrease. 32. The graph of an estimated cost represented by cost equation, Y = a + bx, would be best described by which of the following descriptions: A) A positive slope starting at the point of origin B) A positive slope starting at the y-intercept C) A horizontal line starting at the y-intercept D) A negative slope starting at the y-intercept