Question: Production yields vary and can be high or low on a given day. If they are high, you want to find out why so that

Production yields vary and can be high or low on a given day. If they are high, you want to find out why so that yields could be similarly increased on other days. If they are low, you want to fix the problem. You have just learned that today’s production yields seem to be lower than usual. Should you use a one-sided test or a two-sided test to investigate? Why?

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