Discussion:
Q: A researcher wishes to try three different techniques to lower blood pressure of individuals diagnosed with high blood pressure. The subjects are randomly assigned to three groups; the first group takes medication, the second group exercises, and the third group follows a special diet. After four weeks, the reduction in each person's blood pressure is recorded. At α = 0.05, test the claim that there is no difference among the means. The data are shown.
Medication Exercise Diet
10 6 5
12 8 9
9 3 12
15 0 8
13 2 4
__ __ __
X1 = 11.8 X2 = 3.8 X3 = 7.6
s12 = 5.7 s22 = 10.2 s32 = 10.3