The HR space as well as any service area can complete process improvement without heavy math or statistics. Identify and utilize a software program that will do the analysis for you.
Like many of you I am not a math wiz. So much so my wife won’t even let me near the checkbook. But I can function in this data sensitive world with the use of an Excel based software program. You take your numbers plug them into the Excel worksheet template and it foes the calculations for you. I use either QI Macros or SigmaXL