The GRE (Graduate Record Exam) is like the SAT exam except it is used for application to graduate school instead of college. The mean GRE scores for all examinees tested between July 1, 2006, and June 20, 2009, are as follows: Verbal 456, Quantitative 590, Analytic Writing 3.8. If we consider the population to be all people who took the test during this time period, are these parameters or statistics? What notation would be appropriate for each of them? Suppose we take 1000 different random samples, each of size n = 50, from each of the three exam types and record the mean score for each sample. Where would the distribution of sample means be centered for each type of exam?