i've attached the question below, please explain what formulas you use and also we are not allowed to use excel.

Nine individuals with tension headaches participated in an experiment designed to reduce the headaches by reducing muscle tension. The subjects kept daily logs of the number of headaches they experience during a 2-week baseline period. Next, the participants were trained to lower their muscle tension in the head region using a biofeedback device. After 6 weeks of training, they again kept a 2-week log of the number of headaches experienced. The following are the number of headaches recorded during each 2-week period. a) Complete the table below and compute the standard deviation of the difference (SD ) (3 marks). Subject No. of Headaches No. Baseline After D D - MD (D - MD) 2 Training 17 14 13 NO H NOW N VW b) Use a one-tailed test with a = .05 to determine whether the treatment was successful (9 marks). c) Report and interpret the effect size using Cohen's d (3 marks). d) Report and interpret the 95% confidence interval (4 marks)