# Understanding, Calculating, and Using Statistical Power - Webinar

• ID: 4428072
• Webinar
• 90 Minutes
• NetZealous
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Statistical power is an indicator of the ability of a test of significance to 'detect' a practical difference (e.g., between the averages of two products that are being compared). A low power typically means that the sample sizes in the study are too small. Without an analysis of statistical power, a conclusion of 'non-significant' is rightfully questionable. Unless power is high, a study may be doomed to failure even before it is begun.

This webinar provides thorough training in how to interpret and use the power-analysis outputted by text-book calculations or software programs modules (e.g., StatgraphicsCenturionXV).

Why You Should Attend: Whenever a test of statistical significance is conducted with the hope that the result will be non-significant, the results may be unacceptable to a regulatory agency unless the test had an acceptable level of 'power'. FDA typically requires a minimum of 80% power, and often requires 90% power. Calculation of power is so complicated that it typically must be done with a software program. Even so, the software program's output can be misunderstood unless the user has a firm understanding of the basic concept of statistical power.

This webinar explains the basics, by using a t-test as an example. One of the very many possible formulas is then demonstrated, as well as 2 different software programs and their 'Power Curves'.

Areas Covered in the Session:
Vocabulary and Concepts
t-Tests and p-values
Statistical power
for t-Tests
critical difference to detect
example calculations
Power Curves
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