Power 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 sample size for ...

Determination of sample size is one of the critical decisions in forming a customer survey. Though you can find numerable statistical guides, and sample size calculators available, many people find ...

If a tax impact study, derived from observations on income tax returns, is to provide tax estimates with the same margin of error and significance level for each ...

Reviewed by Eric Estevez It's possible to calculate the standard error in MATLAB by running a one-line command. Standard ...

Back in the day, we learned in statistics that you need a sample size of at least 2% of the size of population to make statistically significant conclusions about the behavior of the population. In ...

A statistical model developed from scientific theory may "fail to fit" the available data if the scientific theory is incorrect or if the sample size is too small. The former point is obvious but the ...