I have a degree in Engineering. Now I am back to school, for a 2 year Master's degree in Statistics. The second semester just started. And there will be a 3rd. Is there a chance that I will need complex numbers? My background in Complex Analysis is very limited. Should I study any Complex Analysis? What books? This is a Statistics course, so they don't teach other than Statistics! At least that's how it was in the 1st semester. Thanks.