The difference between the null hypothesis and the alternative hypothesis are on the sense of the tests. In statistical inference, the null hypothesis should be in a positive sense such in a sense,...
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.
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"...