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The hypothesis in research is an idea or concept that may be true. Through proper experimentation, a hypothesis can become a fact. So, in research, you test a hypothesis to see if it is true. You will see that the null hypothesis, from the related link, is what you are testing against. Perhaps you have a new medicine, and you want to know if it improves the health of a patient. Your null hypothesis is that this treatment does not cause any improvement.
Through observation, survey, or secondary data
Make objective decisions about the validity of the hypotheses.
Marble is not transparent (can't see an image through it). Thinly cut marble is translucent (can see light through it).
Through bar charts.