Given the monthly returns that follow, find the R2, alpha, and beta of the portfolio. Compute the average return differential with and without sign. Do not round Intermediate calculations. Round your answers to two decimal places. Month R Alpha Beta: Average return difference (with signs): Portfolio Return S&P 500 Return January 5.8% 6.1% February -2.7 -3.2 March -1.5 -1.3 April 2.8 2.1 May 0.9 0.1 June 1.1 -0.5 July 0.2 0.6 August 1.8 1.9 September -0.8 -0.6 October -3.3 -3.8 November 2.2 1.8 December 0.5 0.4 Average return difference (without signs) %