Plasma Pathology has incurred the following costs in its diagnostic blood laboratory during the past 12 months:

Required:
1. Use regression analysis to estimate the variable cost per blood test and the fixed cost per month.
2. Develop a formula to express the cost behaviour exhibited by Plasma Pathology's costs.
3. Predict the total cost in a month when 5500 tests are performed.

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Cost Number of blood tests completed Month $90 000 6100 January 87 000 5300 February 76 200 4900 March 78 100 4800 April 80 700 5050 May 61 000 3050 June 4500 74 500 July 99 000 7100 August 6200 95 600 September 74 800 4700 October 89 000 5900 November 6000 91 000 December