Estimating a cost function, high-low method. Laurie Darley is examining customer-service costs in the southern region of Capitol Products. Capitol Products has more than 200 separate electrical products that are sold with a six-month guarantee of full repair or replacement with a new product. When a product is returned by a customer, a service report is prepared. This service report includes details of the problem and the time and cost of resolving the problem. Weekly data for the most recent 8 week period are as follows: Use the high-low method to compute the cost function, relating customer-service costs to the number of service reports