The difference between the distributions captures ... “How was the sample size chosen to ensure adequate power to detect a pre-specified effect size?” Here we discuss inference errors and ...

Learning goals: Understand the concept of power and how it is related to sample size and design. Understand the difference between the distribution that a test statistic would have if the null ...

you have to take the risk that you'll end up with no difference between groups, no matter how big the true effect size. You can calculate that risk by using sample size formulae. Power is 1 minus ...

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 ...

State the factors that affect power and what factors we have to specify to do a sample size calculation ... let’s suppose we want to detect a difference of 250g in birth weight between two groups of ...