For a hypothesis to be considered scientific, it must be testable–it must, in principle, be capable of being proven wrong.

An experiment has two independent variables. One has two levels and the other has three levels.

A hypothesis is a testable model aimed at describing a phenomenon that can be tested or proved. It matters that a model is testable, so that it may be proven or rejected. If it is not testable, there is no way to prove the hypothesis as true or false.

A hypothesis is a tentative and testable explanation, based on observation(s). A hypothesis can be supported or refuted through experimentation or more observation. A hypothesis can be disproven, but not proven to be true.

Upon analysis of the results, a hypothesis can be rejected or modified, but it can never be proven to be correct 100 percent of the time. For example, relativity has been tested many times, so it is generally accepted as true, but there could be an instance, which has not been encountered, where it is not true.

“New information is discovered that contradicts the existing theory” is the situation among the choices given in the question that would result in a theory being replaced rather than revised. so the answer would be New information is discovered that contradicts the existing theory.

A hypothesis is a possible explanation for a set of observations or an answer to a scientific question. A hypothesis must be testable and measurable. This means that researchers must be able to carry out investi- gations and gather evidence that will either support or disprove the hypothesis.