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 ...

Statistics is difficult, and choosing the proper tools becomes more challenging as experiments become more complex. That's why it's not uncommon for large genetics or epidemiological studies to have a ...

On rearranging, this becomes Equation 4: It is now apparent that the humble average is the best least squares estimator for the data model, Y = X + ε, which is the measure of location. In addition, ...

Define statistical power List the potential consequences of doing a study that has low power, and also a study that has too much power. Explain what a type 1 and type ...

Read on to learn more about what a t-test is, the different formulas used, and when to apply each type to compare means and ...