small sample size statistics - Business Performance Improvement (BPI)

March 6, 2021March 6, 2021 bizpi

Why do we need 30 data samples?

I saw this question on a forum, and I wanted to give my response. Since the forum is under a

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October 2, 2013November 11, 2019 bizpi

Zero defects does not mean the problem is solved

One of the common mistakes made by companies is the assumption that the lack of defects means the problem has

Lean Six Sigma Bursts

We share our takes and thoughts on a variety of topics related to process improvement (specifically Lean and Six Sigma methods), Bursts are rapid improvement activities, so this sounded like a good word to use for these short audio clips. We’ll try to keep them under 5 minutes each.

The following was a clip from a recent presentation, where I discuss how hypothesis testing can help you draw more statistically valid conclusions from data, and avoid misleading or incorrect conclusions.

I share two examples. The first was a data set from the Denver Sheriff's Department, where they graphed and analyzed intake use of force incidents, but their conclusions don't seem to match the graphic.

The 2nd example was data I pulled for a nonprofit I ran that showed the day of the week and time of day had no impact on click through rates on our monthly email newsletter.

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