time series analysis

A return series " follows an AR(2) model: r = 3 4 0.Art-1 + 0.2rt 2 + or, where t is measured in days. The white noise series of is assumed to be normally distributed with mean zero and standard deviation . = 1.8. If today's return was 72 4 and yesterday's was "4 1 -3 then a 95%% confidence interval for the two-day forecast is approximately A. 12.4.9.41 Outsome er the others