How to Choose a Sample Size in Qualitative Research. Quantitative research relies on analyzing statistical data, while qualitative research focuses on answering important business questions ...

Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

In planning a research study, investigators are frequently uncertain regarding the minimal number of subjects needed to adequately test a hypothesis of interest. The present paper discusses the sample ...

The power calculation approach to the determination of sample size for comparing two independent means and two independent proportions in cross-sectional surveys, cohort studies, case-control studies, ...