The t-distributions have similar characteristics to the standard normal distribution (Z) except that O the t-distributions are unimodel only when the sample size is small, but the 2 curve is always unimodal if the sample size is large. the t-distributions have more area under its curves in the talls, Oconfidence intervals created with the t-distributions are always shorter than those created using the 2-distribution the t-distributions are symmetric about the degrees of freedom and the standard normal distribution is symmetric about the meari U