please dear answer this question in details ( with equations)
« Can a person control certain body functions if that person is trained in a program of biofeedback exercises? An experiment is conducted to show that blood pressure levels can be consciously reduced in people trained in this program. The blood pressure measurements (in millimeters of mercury) listed in the table below represent readings before and after biofeedback training of six subjects. » Do the data provide enough evidence to indicate that the mean blood pressure level decreases after training? Use α = .05.
Before : 136.9 ; 201.4 ; 166.8 ; 150.0 ; 173.2 ; 169.3
After : 130.2 ; 180.7 ; 149.6 ; 153.2 ; 162.6 ; 160.1