Question 4 (13) Cost function Queen Dairy reported overhead cost information for three levels of activities measured by per cow per day (referred to as an animal day) within the production relevant range as follow: Required: a. Identify each of the company's costs as being either variable, fixed, or mixed costs. (2.5) b. By use of the high-low method, separate total mixed costs into variable and fixed elements. State the cost ormula for total mixed costs. (3) c. Data was gathered on mixed costs and the number of animal days for the past 12 months. Based on the data, the following regression results are obtained: You can obtain the t-statistic from the t-table attached. Please analyse and present the cost function based on the regression results from four aspects of regression analysis with 95% confidence. (5) d. Estimate total mixed cost using a cost function that you believe is the best function from part b) and c) if animal days =4,500.(2.5)