Calculate s (standard deviation) and A. (average deviation) for the following sample: 2, 2, 6, 9, 10, 10, 15, 18, 18, 20.

Calculate s (standard deviation) and A.D. (average deviation) for the following sample: 2, 2, 6, 9, 10, 10, 15, 18, 18, 20. Provide two examples of when this would be appropriate to use in in research and two examples of when it would not be appropriate to use in research.