Either works, given the often-contrary nature of the English usage of H. However, I've heard "a hypothesis" more than "an hypothesis". Improved Answered: In instances where words that begin with "h"...
A hypothesis is an uneducated guess, statement, or observation during a Lab and the hypothesis needs to be tested. So mainly it isn't the conclusion to an experiment.
No. The null hypothesis is assumed to be correct unless there is sufficient evidence from the sample and the given criteria (significance level) to reject it.