Suppose a hypertension trial is mounted and 18 participants are randomly assigned to one of the comparison treatments. Each participant takes the assigned medication and his or her systolic blood pressure is recorded after 6 months on the assigned treatment. The data are as follows.

Standard Treatment Placebo New Treatment

124 140 114

117 143 113

133 148 121

128 146 120

131 150 122

115 160 128

Is there a difference in mean systolic blood pressure among treatments? Run the appropriate test at = 0.05.

Please provide an answer and explanation.