Stating a formal hypothesis can be done in variety of ways. One of the easier ways in which to create your hypotheses is to 1) decide what you want to conclude based on the literature (what we previously called our informal hypothesis) and then 2) Convert this to a mathematical equation based (i.e. one group Belize < Samoa). 3) Convert our culture names to the symbol representing them (either mu1 or mu2). This is our alternative hypothesis.
Now to state our null hypothesis, we simply include all other possibilities. If our alternative hypothesis is that one group is < than the other, then the null would have to include all other possibilities, i.e. greater than or equal to.