A group of 9 7th grade students participated in a workshop on developing and supporting healthy romantic and platonic relationships. At the end of the workshop, they completed an evaluation that tested their knowledge. Their mean on the evaluation was a 14.5, with a standard deviation of 1.83. A group of 10 7th grade students who did not participate in the workshop also completed the evaluation. They had a mean of 3.5 and a standard deviation of 1.5. The higher the score on the evaluation the greater the knowledge on the subject. Calculate the t statistic, and determine whether it is statistically significant