Question: Why is the population mean almost always equal to 0 for the null hypothesis in the two-tailed, paired-samples t test?

Why is the population mean almost always equal to 0 for the null hypothesis in the two-tailed, paired-samples t test?

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Why is the population mean almost always equal to 0 for the null hypothesis in the two-tailed, paired-samples t test?

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Why is the population mean almost always equal to 0 for the null hypothesis in the two-tailed, paired-samples t test?

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