Post your answer to 1 of the 3 questions with explanation and details. Please fo

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Post your answer to 1 of the 3 questions with explanation and details. Please follow the Community Café Guidelines for participating in the Community Café. 
What is the process for ensuring an adequate and proper sample size for a study? 
What are disadvantages of a convenience sample?
What are three disadvantages to an observational study design? 

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