A hypothesis that can't be tested, can't be proved.
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A hypothesis can be tested by an experiment
Not unless its tested by experimentation. If its tested by experimentation. And then if found to be true its no longer just a hypothesis. And if found to be false it becomes an invalid hypothesis, which anyone in their right mind would withdraw as a hypothesis.
The hypothesis which has been tested and verified repeatedly by tests is called theory.
A scientific theory is a hypothesis that has been repeatedly tested and still seems to be valid. These theories are tested by using the scientific method.