How do I calculate the sample size for my research?

Sample size is an elusive topic. While completing my master’s and doctorate degrees, the issue never arose! First, the sample size is determined in coordination with a preselected power (typically .80), alpha (typically .05), and an effect size (typically .50). Secondly, the sample size is different for different analyses (e.g., for multiple regression, t-tests, etc.) At www.StatisticsSolutions.com we use Cohen’s articles on statistical power and G-power (online) to calculate the required N. For more information you can email us at www.StatisticsSolutions.com or call us at 877-437-8622.