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 2week baseline period. Next. the participants were lrained to lower their muscle tension in the head region using a biofeedback device. Aer 6 weeks of training. they again kept a 2week log ofthe number of headaches experienced. The following are the number of headaches lrecorded during each 2week period a) Complete the table below and compute the standard deviation of the difference [Egg marks]. nmmummeunn b] Use a one-tailed test with cl. = .05 to determine whether le treatmentwas successful [9 marks]. c] Report and interpretthe effect size using Cohen's d [3 marks]. d] Report and interpretthe 95% condence interval [4- marks]