what is the best test of change between the two aggregate scores for two sampling periods? how to calculate the change between a population and a sampling period what is the best test to check for variation between two data sets? what is the best test for predicting change between aggregate scores for a sample best test of change between aggregate scores what is the best test to test for a change in score between two sampling periods? what is the best test to compare two sampling periods? how to test the change in a population what is the best measure of statistically significant change between the two measurement periods? when do i test whether a sample has changed between two time periods how many times are population scores measured at two different time periods? what is the best test for statistically significant change between the two measure periods? how does the percentage score affect what is the best test to measure variation between two sample periods? what is the best test to compare scores across sampling periods? what is the best test for statistically significant change between the two scores? how to measure a change in scores in a population what is the best test of statistically significant change between the two measurements period how to test for a change in the aggregate scores what is the best test of change between the aggregate scores for two sampling periods