Determine the availability of subjects for your research. Setting rigid qualifications for study subjects reduces the sample size due to the limited number of people meeting your standards.

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 ...

By using a sample size calculator, you can figure out how many people is enough, ensuring confidence in your statistics.

An approximate test and confidence interval for coefficient alpha are derived. The approximate test and confidence interval are then used to derive closed-form sample size formulas. The sample size ...