Alvarez Manufacturing Inc. is a job shop. The management of Alvarez Manufacturing Inc. uses the cost information from the job sheets to assess cost performance. Information on the total cost, product type, and quantity of items produced is as follows:
a. Develop a graph for each product (three graphs) with Job Number (in date order) on the horizontal axis and Unit Cost on the vertical axis. Use this information to determine Alvarez Manufacturing Inc.’s cost performance over time for the three products. 

b. What additional information would you require in order to investigate Alvarez Manufacturing Inc.’s cost performance more recisely?

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Quantity 520 Amount $16,120 Job No. Product Date Jan. 2 TT 1,610 20,125 22 Jan. 15 1,420 25,560 Feb. 3 30 TT 670 15,075 Mar. 7 41 SLK 2,210 22,100 Mar. 24 49 SLK 2,550 31,875 58 May 19 June 12 TT 620 10,540 65 78 SLK 3,110 48,205 Aug. 18 1,210 16,940 82 Sept. 2 Nov. 14 TT 750 8,250 92 98 SLK 2,700 52,650 Dec. 12