Required information Problem 6-42 Continuation of Preceding Problem; Computing Least-Squares Regression Estimates; Comparing Multiple Methods (Appendix) (LO 6-1, 6-2, 6-5, 6-6, 6-9) [The following information applies to the questions displayed below.] Martha's Vineyard Marine Supply is a wholesaler for a large variety of boating and fishing equipment. The company's controller, Mathew Knight, has recently completed a cost study of the firm's material-handling department in which he used work measurement to quantify the department's activity. The control factor unit used in the work-measurement study was hundreds of pounds of equipment unloaded or loaded at the company's loading dock. Knight compiled the following data. Month equipment loaded or unloaded) Units of Activity (hundreds of pounds of Material-Handling Department Costs January February 2,700 $12,600 2,500 12,200 March 2,200 11,700 April 1,900 11,100 May 3,100 12,000 June 3,300 13,900 July 2,900 12,900 August 2,700 12,300 September 3,500 13,200 October 2,000 11,500 November 2,100 12,250 December 2,300 12,250