Question: In their book, Common Errors in Statistics (and How to Avoid Them), Good and Hardin (2003) wrote, No one will know whether your [one-tailed] hypothesis

In their book, Common Errors in Statistics (and How to Avoid Them), Good and Hardin (2003) wrote, "No one will know whether your [one-tailed] hypothesis was conceived before you started or only after you had examined the data" (p. 347). Why do the authors state this as a concern for one tailed tests?

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