(Answered) Question describing hypothesis testing blouin and riopelle

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Question: Describing hypothesis testing. Blouin and Riopelle (2004) made the following statement concerning how scientists select test statistics: "[This] test is the norm for conducting a test of H0, when the population(s) are normal with known variance(s) " (p. 78). Based on this description, what test statistic are they describing as the norm? How do you know this?

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