https://calculator.drsimonj.com/ 2025-01-15 monthly 1.0 https://calculator.drsimonj.com/sample-size 2025-01-15 monthly 0.9 https://calculator.drsimonj.com/test-duration 2025-01-15 monthly 0.9 https://calculator.drsimonj.com/effect-detection 2025-01-15 monthly 0.9 https://calculator.drsimonj.com/test-results 2025-01-15 monthly 0.9 https://calculator.drsimonj.com/validation 2025-01-15 monthly 0.5