Aver, Erik2012-09-112012-09-112012-07https://hdl.handle.net/11299/133135University of Minnesota Ph.D. dissertation. July 2012. Major: Physics. Advisors: Keith A. Olive & Evan D. Skillman. 1 computer file (PDF); viii, 118 pages.en-USBig Bang NucleosynthesisCosmologyDwarf GalaxiesExtragalactic AstrophysicsPhysicsSelf-consistent helium abundance determinations using Markov Chain Monte CarloThesis or Dissertation