Useful formula to determine an exact sample size for qualitative research: https://www.smashingmagazine.com/2017/03/user-research-sample-size-data/
Web design, development and analytics resources shared by the Internet Services team of Lehigh University.
Useful formula to determine an exact sample size for qualitative research: https://www.smashingmagazine.com/2017/03/user-research-sample-size-data/