5. Different relaxation techniques are given to randomly selected patients in an effort to reduce their stress levels. A special instrument has been designed to measure the percentage of stress reduction in each person. The data are shown below. At a = 0.05. can one conclude that there is a difference in the means of the percentages? Next, if the null hypothesis is rejected, conduct a post hoc test using Tukey to examine which technique is significantly different at 10% probability level. Technique 1 Technique 2 Technique 3 Technique 4 10 12 13 9 10 12 6 8 13 15 10 14 15 14 8 11 11 11 11 13 (20 marks)