Sample Sizes for Analyses of Means and Proportions
Abstract:
An issue that must be resolved early in any research project concerns the sample size required to satisfactorily address the research objectives. In many cases, a researcher's questions can be answered via statistical analyses of sample means and/or proportions. This report describes the statistical issues involved in sample size estimation and presents formulas for determining -from a statistical point of view - appropriate sample sizes for analyses of means and proportions from one sample or from two independent samples.
