A hypothesis is merely a proposition that is presented or put forward by a scientist to explain a natural phenomenon. It does not become a theory until it is proved and tested under different conditions and circumstances.Scientists or researchers make up hypothesis to see if they hold water. They conduct a number of experiments and test this hypothesis, and if the hypothesis indeed proves correct, it is deemed to have become a theory.
An assumption is any statement that is believed to be true. Many times, people pay dearly when they jump to conclusions based upon their assumptions. Thinking about the feelings of others is merely assumption as there is no way to tell what a person is thinking or feeling.