A valid hypothesis is one that is testable and rejectable, can be proven true as well as verified without external evidence. It also needs to be accepted by public opinion.
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Scientists use the data from an experiment to evaluate the hypothesis and draw a valid conclusion.
You first have to come up with a hypothesis. Review the relevant work already completed out there. Design an experiment around to test your hypothesis. Conduct the experiment and analyze the results. Write a summary report. Using the data from the experiment to evaluate the hypothesis in order to draw a valid conclusions.
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.
No To form a hypothesis is an attempt to explain something just by your own thought (could be anything, but typically an observation, phenomenon, or some other scientific problem). To be a "valid hypothesis" the hypothesis should be testable (typically through empiric investigation) ... and it probably shouldn't sound outright absurd (from a scientific POW) ... depends. ... hope that helps.
When we've proven that the hypothesis is false !