Assuming that the distribution of scores on the Delinquent Behavior score for the students in the norm group is normal, the middle 68% had scores between what two values? Statistical Guide T scores have a mean of 50.00 and a standard deviation of 10.00 in the norm group on which a new test is standardized. Test makers prepare norms tables that allow us to convert a person's raw score (points earned) to the T score equivalents that would have been obtained if that person had been in the norm group. Likewise, we can compare the mean and standard deviation of another group to the mean of 50.00 and standard deviation of I 0.00 in the norm group. Since there are about three standard deviation units on both sides of the mean in a normal distribution, in practice, T scores can range from 20.00 to 80.00 (i.e., 3 x the standard deviation of 10.00 the mean of 50.00). 1 Excerpt from the Research Article Subjects consisted of 44 adolescents (I 7 males and 27 females) 12 to 18 years of age [who had a] minimum of 20% absences from school in the 4 weeks prior to evaluation for the study