How do I report a negative 95% CI in a one sample t test? What does this mean?
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Maybe this can help: http://stats.stackexchange.com/questions/167972/why-is-there-a-need-for-a-sampling-distribution-to-find-confidence-intervals/167998#167998 – Aug 30 '15 at 09:55
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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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(+1) except for the last sentence. The CI is for the true mean, not for the mean of the data. – Michael M Aug 30 '15 at 08:43