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Starbucks expects its baristas to complete a drive through order in no more than 50 seconds (Heather Haddon, Starbucks Is Rethinking Almost Everything, Including How
Starbucks expects its baristas to complete a drive through order in no more than 50 seconds (Heather Haddon, "Starbucks Is Rethinking Almost Everything, Including How to Make Frappuccinos," The Wall Street Journal, August 31, 2022). Suppose that the management intends to redesign and retrain at any store whose average is not 50 seconds. Starbucks Embraces the Drive-Thru - Bloomberg A management team observes a sample of 100 customer orders at a particular store. The average order is completed in 58 seconds, and the sample standard deviation is 3. Even though the average time is over 50 seconds, why should the team do a hypothesis test before proceeding? The average time is from a sample. A hypothesis test can help the team know whether the average of all orders is greater than 50 seconds. A hypothesis test can help the management team prioritize which stores are most in need of redesigning and retraining. A hypothesis test can help the management team know why the average is higher at this store. A hypothesis test can help the management team decide whether it's worth the cost to redesign and retrain. A hypothesis test can help the management team know whether the times were affected by the barristas knowing that they were being observed
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