Question: When do we need to find out about determining whether data sets are normally distributed?And why do we need to find this out?If we run

When do we need to find out about determining whether data sets are normally distributed?And why do we need to find this out?If we run a mann-whitney test, can we also run a 2-sample t test?I am trying to measure waiting time with 2 separate data sets - one set before the implementation of Lean methodology, and the other set after the implementation of Lean.Please advise.

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