The difference between a Hypothesis and a Theory
Hypothesis are claims about observations that can either be accurate or inaccurate.
For example, the statement: the average weight of Americans studying at Harvard is 45kg. This statement can either be true or false. We can only test this hypothesis by recording the weight of each and every American student studying at Harvard and then finding out whether the average weight is indeed 45kg.
A theory, on the other hand, are hypotheses that have been empirically tested to be true. Theories are considered highly plausible because they have withstood attempt to refute on logical grounds, historical, qualitative or quantitatively analysis.