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You make a valid point about the need for hypothesis tests. If it’s possible to clearly verify a root cause with data or observation, then you wouldn’t need to conduct a hypothesis test. We chose a simple example in order to make the topic more digestible to people who might otherwise avoid the topic. The…
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Elisabeth Swan

Elisabeth is a Master Black Belt at, the co-author of The Problem-Solver’s Toolkit and co-host of the Just-in-Time Cafe. For over 30 years, she's helped leading organizations like Amazon, Charles Schwab and Marriott International, Inc. build problem-solving muscles with Lean Six Sigma to achieve their goals.