Talk:Variance of the mean and predicted responses

Is that a t distribution?
There is some strange notation in the confidence intervals section. It looks like the formula involves a t-distribution, but it is unclear what the degrees of freedom are. Also, it doesn't seem to indicate whether one should find the t-value for a given probability, or the probability for a given t-value. Finally, does this imply that the mean and predicted responses follow t-distributions? The article offers mean and variance, but never indicates what the underlying distribution is. — Preceding unsigned comment added by 108.4.155.7 (talk) 08:58, 27 November 2012 (UTC)