What sampling technique was used to select the sample for the study?  


  Does the technique give a sample that is representative of the population?  


  Describe the method for collecting data  


  Identify possible flaws or biases in the study selected  


  Describe the meaning of the probability in the article in context  

Data Classification  


 Does the data collected for the study represent a population or a sample?  


 Are the numerical descriptions of the data parameters or statistics?  


 What concerns (or questions) about the data collection process do we have?