A researcher wishes to try three different techniques to lower the blood pressure of individuals with high blood pressure. The subjects are randomly selected and assigned to three groups; the first group takes medication, the second group exercises, the third group follows a special diet. After 4 weeks, the reduction in each person's blood pressure is recorded. At { = 0.05, test the claim that there is no difference among the means.

Medication   Exercise    Diet
10                  6           5
12                  8           9
9                    3          12
15                  0           8
13                 24