Words/phrases may be used more than once: Power analysis is best used [ Select ] V data collection, to be sure that you have a sufficient [ Select ] V to achieve a desired [ Select ] V (and its associated Type II error rate) at a given [ Select ] V (i.e. tolerable Type | error rate) and an appropriate [ Select ] V (i.e. minimum difference of interest) for the practical situation. In addition, power analysis may help evaluate the study [ Select ] V when there is a restricted [ Select ]