# How do I report a 95% CI in a one sample t test?

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

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.