Sample size: Degrees of Freedom and Sample Size: Finding the Right

Degrees of Freedom Calculator

Power and Sample Size Determination

The t-Distribution, Introduction to Statistics

Independent Pieces - FasterCapital

Degrees of Freedom: Understanding the Power of t Distribution - FasterCapital

Confidence interval - Wikipedia

Degrees of Freedom in Statistics - Statistics By Jim

Low Statistical Power - FasterCapital

Degrees of Freedom: Unraveling the Key Concept behind the t distribution - FasterCapital