c and e please (:

a 11. An instructor wants to determine whether using a mindfulness strategy before a quiz will improve performance for students with test anxiety. Two groups of students are recruited, n = 12. Both groups have test anxiety, Group one takes the quiz as they normally would and group two participates in a mindfulness activity before the quiz. The data are summarized below: Group 1 n=12 SS = 62 M = 20 Group 2 n=12 SS = 70 M = 22 c. What is the critical boundary using 2-tailed a = .05? e. What is the standard error of the mean