1.	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