Explore how discernibility level (α), sample size (n), effect size (δ), and population variability (σ) interact to determine statistical power.
A note on wording: α is the discernibility level here, following the course text. Many books and exercise sets call the same number the significance level — they mean the same thing.
Two overlapping normal distributions represent the sampling distribution of the sample mean under:
The standard error of each distribution is σ / √n. Increasing n makes both curves narrower.