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How do I report a negative 95% CI in a one sample t test? What does this mean?

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A one-sample $t$-test is a test of whether your observed mean is equal to some pre-specified null value (usually $0$). That is equivalent to seeing if the 95% CI for your observed mean includes the null value. They want you to report a 95% CI for the mean of your data.

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  • $\begingroup$ (+1) except for the last sentence. The CI is for the true mean, not for the mean of the data. $\endgroup$
    – Michael M
    Aug 30, 2015 at 8:43

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