What is statistical power? What information is needed to decide what sample size is required to obtain some desired level of power (such as 80%).
Answer to relevant QuestionsWhat recommendations did the APA task force make about reporting statistical results (are significance tests alone sufficient?) Suppose a researcher writes in a journal article that “the obtained p was p = .032; thus, there is only a 3.2% chance that the null hypothesis is correct.” Is this a correct or incorrect statement? What is an “exact” p value? Why is it important to assess whether missing values are randomly distributed throughout the participants and measures? Or to put this in other words: why is it important to understand what processes lead to missing values? A non-experimental study was done to assess the impact of the accident at the Three Mile Island (TMI) nuclear power plant on nearby residents (Baum, Gatchel, and Schaeffer, 1983). Data were collected from residents of the ...
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