you have estimated the following ARMA(1,1) model for some time series data : Yt=0.076+0.62Y-1+0.44U-1+U suppose that you have data for time to t-1 i.e you know that Yt-1= -6.8 and -1 =-2.5 1) obtain forcasts for the series y for times t,t+1 and t+2 using the estimated ARMA model. 2) if the actual values for the series tirned out to be -3.42,-37.1 and -2.232 for t,t+1 and t+2, respectively, calculate the (out of sample) mean squared error