In order to conduct a test of hypothesis on wether participation in peer tutorial services improves exam scores in Math, a sample of 10 students were given an exam before and after participation in peer tutorial services. Data collected consisted of the student's exam scores before and after taking the tutorials. The appropriate test statistic to apply will follow a ... distribution with ... degrees of freedom, if the null hypothesis is true. a) Student's t - , 10 b) Student's t - , 9 c) Standard Normal, 10 d) Chi-Square, 11