The

**t procedures**are**robust against**non-normality of the population when there are no**outliers**, especially when the distribution is roughly symmetric and unimodal. When is it appropriate**to**use the**t procedures**? n>15: The**t procedure**can be used except in the presence of**outliers**or strong skewness.What is a t distribution table?

In probability and statistics, Student's t-

**distribution**(or simply the t-**distribution**) is any member of a family of continuous probability**distributions**that arises when estimating the mean of a normally distributed population in situations where the sample size is small and population standard deviation is unknown.What is a T score?

T-

**scores**are standardized**scores**on each dimension for each type. A**score**of 50 represents the mean. A difference of 10 from the mean indicates a difference of one standard deviation. Thus, a**score**of 60 is one standard deviation above the mean, while a**score**of 30 is two standard deviations below the mean.