added HW2 code
added HW2 code

longphin/Stuff,longphin/Stuff,longphin/Stuff,longphin/Bayesian---STA250,longphin/Bayesian---STA250,longphin/Bayesian---STA250,longphin/Bayesian---STA250,longphin/Bayesian---STA250,longphin/Stuff,longphin/Stuff