Two-Proportions Test & Fisher’s Exact Test Two-Tail Calculator
Two-proportions test and Fisher’s exact test two-tail calculator are statistical tools used to compare two proportions. They help determine if there’s a significant difference between two groups.
How to Use This Calculator
- Enter the sample sizes and total sizes for both groups.
- Click ‘Calculate’.
- View the results and interpretation below.
Formula & Methodology
The two-proportions test uses a Z-test or chi-square test, while Fisher’s exact test is used when sample sizes are small. Both tests compare observed and expected frequencies…
Real-World Examples
Data & Statistics
| Group | Sample Size | Total Size | Proportion |
|---|---|---|---|
| A | 50 | 100 | 0.5 |
| B | 60 | 120 | 0.33 |
Expert Tips
- Ensure your samples are representative of the population.
- Consider the power of your test to avoid false negatives.
- Interpret results with caution, considering context and other factors.
Interactive FAQ
What’s the difference between these tests?
The two-proportions test is used when sample sizes are large, while Fisher’s exact test is used when they’re small.
CDC’s StatCalc and UBC’s Sample Size Calculator are authoritative sources for further reading.