Tagged: sample size
← All topicsArticles tagged with sample size in Stats and Cats.
- Confidence Intervals
One-sample confidence intervals for means, proportions, and variance, plus sample size formulas.
- Sample Size Calculation
How to calculate required sample size for a two-sample t-test and a chi-square test, given a target effect size, significance level, and power.
- Statistical Power: Why Small Studies Often Find Nothing
Power is the probability of detecting an effect that actually exists. A study that finds nothing may simply have been too small to find anything. Here's what determines power and why it matters before collecting data.
- Effect Size and Statistical Power
How to measure and interpret Cohen's d, eta-squared, and r. What statistical power means, what determines it, and why it belongs before data collection.