Useful online/ app stats testing programmes…
- Maritz website: https://dev.maritzcx.com/maritz-stats/ttest/
- Bonamy Finch SigTester app – free to download (Andoid and Apple)
- Online stats tester: https://www.surveystar.com/ztest.htm
- Search for sscalc
- Online sample size calculator: https://www.raosoft.com/samplesize.html