Using the following information regarding actual sales for Sam's Ski Supplies, calculate the regression line: Sales for Sam's Ski Supplies Month First Year Second Year January 380 400 February 340 360 March 320 330 April 280 290 May 265 270 June 230 235 July 220 230 August 200 205 September 210 220 October 250 270 November 400 450 December 450 502 a) y = 264.92 + 2.79x b) y = 264.92 + 1.67x c) y = 283.64 + 2.79x d) y = 283.64 + 1.67x