Describe improvements or extensions to the method that would benefit the above mentioned scientific investigation.
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Answer:
Although science is the best way to come up with accurate explanations for how the world works, not all scientific investigations are created equal. Some are better than others. There are a couple of ways of measuring how good a scientific investigation is. Two terms that are often used are reliability and validity. Reliability is a measure of how repeatable an experiment is - were the results are similar when the experiment was carried out multiple times. But perhaps more important than this is validity, which is a measure of how correct the results of an experiment are.
A particular experiment or investigation can be internally valid and externally valid. Internal validity is about whether the design of the experiment follows the standard steps of the scientific method, and whether the process followed by the experiment makes logical sense. External validity is about figuring out whether the conclusion from the experiment is the real explanation for the phenomenon in the wider world. It examines things like whether there might be an alternative explanation for the result.
If your goal is to make your result as close to the truth about the world as possible, then you need to improve your validity as much as you can. Most scientists are pretty successful making their experiments internally valid, but external validity can be harder to achieve. In this lesson, we going to take a look at a few ways you can improve the validity of your experiments.