After a more sophisticated analysis of Greenscape's costs, Drake has access to the following additional data.

Required:
Refer to the data in the previous case, as well as the additional data above.
1. Use the data for the three cost drivers to formulate a single multiple regression equation to predict total overhead cos.
2. Does the new cost model provide a more accurate estimate of total overhead cost compared to the equation formulated in the prior case? Explain your answer.
3. Consider which cost, drivers should be included in the regression equation to provide the more accurate cost model. Explain your choice.

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Month No. of individual plantings Square metres of turf January 100 96 000 February 60 88 000 March 80 88 000 April 130 102 000 May 106 000 70 June 100 110 000 July 120 000 120 August 32 100 000 September 80 104 000 October 74 90 000 November 80 92 000 120 December 102 000