The Complete Idiot's Guide to Lean Six Sigma

Chapter 15

Find Significant xs

In This Chapter

♦ Collecting data for analysis

♦ The basics of experimental design

♦ Know your sample size

♦ Risk comes in alpha or beta

♦ Calculating sample sizes

♦ Testing your hypotheses

 

Now the real detective work begins. You have a lot of leads from brainstorming, fishboning, process mapping, and failure mode analyzing. Your evidence is still circumstantial, and you need the hard facts to prove your case to the judge—the almighty Process Owner. You also need to present your case to the jury (stakeholders), so they can understand and take action.

In this chapter, we’ll show you how to slice and probe your data until you can explain much of the variation in Y, leaving little to the imagination. You’ll determine what ...