A researcher would like to find out if relaxation will reduce the number of headaches for chronic headaches sufferers. For a week prior to training, each subject records the number of headaches suffered. Subjects then receive relaxation and for the week following training the number of headaches is again measured. The change in number of headaches before and after training is as follows (minus sign indicates a reduction)
If hypothesised that no significant reduction in the frequency of headaches will be observed before and after relaxation training in a sample of chronic headache sufferers. Test at alpha=.05 two tails
-5 -1 -4 -3- 6 -8 0 +1 -1