pls help me out thanks

A researcher wishes to try three different techniques to lower the blood pressure of individuals diagnosed with high blood pressure. The subjects are randomly assigned to three groups; medication, exercise, special diet. After four weeks, the reduction in each person's blood pressure is recorded. At a = 0.05, test the claim that there is no difference among the means. Medication Exercise Diet 13 4 10 10 6 5 12 8 9 19 3 12 15 8 13 NJ 4