Now Playing: Power and Sample Size Primer (12:17)

"Your [PASS] routines are flexible and easy to use and your customer service and support is A-double-plus."

Nayak Polissar, PhD

"PASS is a great program. It does so much and is easy to use. It’s much better than the other sample size programs I’ve used—it has helped me greatly in my research."

Ken Lawson, Ph.D., The University of Texas