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Choosing between a z-test and a t-test.

Under what circumstances would you conduct a z-test? When would you preform a t-test?

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A z-score is a statistical procedure that enables us to assign one numerical value to a score so that it may be compared on a standardized scale. With a Z-score value we can make predictions and determine corresponding ...

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What are the similartities between the shape of the z-test and the t-test? What would prevent you from using a z-score?