How can I tell what "level of evidence" a research article/study is?
Levels Of Evidence:
A "level of evidence" is a heuristic, or rule of thumb, rather than an exact metric. It takes into account the relative strengths and weaknesses of different types of evidence and assigns a number based on that. The lower the number, the stronger the evidence. Measures of evidence level are slightly different in different parts of the world.
Answer and Explanation:
Consider starting with weak evidence and asking what would be stronger evidence. Anecdotes and witness testimony are considered very weak forms of...
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from Earth Science: Middle SchoolChapter 12 / Lesson 9