What Factors Affect the Power of a Z Test? @jbstatistics

Uploaded February 2013 | Updated September 2026, 1 hour ago

A look at what factors influence the power of a hypothesis test. This discussion is in the setting of a one-sample Z test on the population mean, but the concepts hold for many other types of test as well. I discuss what factors affect power, and illustrate the concepts visually using various plots. There are no power calculations carried out in this video; I have another video on calculating power: youtu.be/BJZpx7Mdde4

What Factors Affect the Power of a Z Test?

Intro to Confidence Intervals for One Mean (Sigma Known)

Introduction to Simple Linear Regression

Chi-square Tests of Independence (Chi-square Tests for Two-Way Tables)

An Introduction to the Hypergeometric Distribution

De Morgans Laws (in a probability context)

Introduction to Simple Linear Regression (Old, fast version)

Inference for a Proportion: An Example of a Confidence Interval and a Hypothesis Test

Inference for Two Proportions: An Example

Confidence Intervals for One Mean: Interpreting the Interval

What Factors Affect the Margin of Error? (In a Confidence Interval for One Mean)