DQ 1: What do you view as a specific strength or weakness of using observational techniques, especially in the areas of validity and/or reliability? Give an example. (Your first posting should describe only one strength or weakness that has not already been described by a student who posted before you. After all of the strengths and weaknesses have been described, you may refer to ones that have already been discussed, but use different examples.) Discuss any questions or comments you might have about your classmates’ postings, especially if you do not see how they relate to reliability or validity.

DQ 2: A common problem with the use of available data or existing statistics is known as the ecological fallacy. Describe the ecological fallacy and give an example of one such fallacy. Use a different example than anyone else has used in their responses before yours. Discuss any aspects of the definition of an ecological fallacy that you do not understand or that you think another student has misstated or misunderstood.