## Function T-Test-One-Sample

(

**t-test-one-sample** &rest < args > )

t-test-one-sample (data tails &optional (h0-mean 0) &key start end key)

Returns the t-statistic for the mean of the data, which should be a sequence

of numbers. Let D be the sample mean. The null hypothesis is that D equals the

` H0-mean.' The alternative hypothesis is specified by `

tails': ` :both' means D<br> /= H0-mean, `

:positive' means D > H0-mean, and ` :negative' means D < H0-mean.<br> <br> The function also returns the significance, the standard error, and the degrees<br> of freedom. Signals `

zero-variance' if that condition occurs. Signals

`insufficient-data' unless there are at least two elements in the sample.