Final answer:
A testable question can be answered through experimentation, a non-testable question is subjective or cannot be measured, and a research question guides the research process.
Step-by-step explanation:
In the scientific method, a testable question is one that can be answered through experimentation and observation. It is a question that can be tested using clear procedures and measurements. For example, 'What is the effect of temperature on the growth of plants?' is a testable question because you can design an experiment to measure plant growth at different temperatures.
A non-testable question, on the other hand, is one that cannot be answered through scientific methods. It is typically subjective or cannot be measured. For example, 'What is the meaning of life?' is a non-testable question because it does not involve a testable hypothesis or measurable variables.
A research question is a question that guides the research process. It should meet certain criteria to be considered a good research question, such as being open-ended, debatable, answerable, and consequential. A research question should spark reasonable debate and have multiple possible answers. It should also be able to be answered using the evidence gathered and have a significant impact on the field of study.
So, in summary, a testable question is one that can be answered through experimentation, a non-testable question is subjective or cannot be measured, and a research question is a well-defined question that guides the research process.