The alternativehypothesis (Ha or H1) describes the population parameters that the sample data represent, if the predicted relationship exists. It is always the hypothesis of difference. That is as opposed to the null hypothesis (H0) that describes the population parameters that the sample data represent if the predicted relationship does not exist. See Basic Statistics of the Behavioral Sciences by Heiman.
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The difference is that working hypothesis is that your still working on it but the hypothesis that your not working on it.
A scientific hypothesis has to be testable.
Hypothesis is singular, while Hypotheses is the plural of Hypothesis.
A hypothesis is a suggestion of a way to explain something. If the hypothesis is tested and confirmed, it can advance to the status of theory. The conclusion of testing a hypothesis will be either that the hypothesis is confirmed, or it is not confirmed.
An Observation is an account of what actually happened whilst a Hypothesis is what you think will happen