Sodium Intake and Blood Pressure Experiment

Question: Does sodium intake affect systolic blood pressure in men with Stage 1
hypertension?

Data Collection: Twenty men with Stage 1 hypertension agree to participate in the
study. Men are randomly assigned one of two diets: either a low sodium (50
mmol/day sodium) diet or a high sodium (200 mmol/day sodium) diet. The men are
not told which diet is assigned to them. The men follow the diet for three months. At
the end of three months their supine systolic blood pressure (mmHg) is taken.

Data:
Low sodium (50 mmol/day)
143
136
126
165
145
135
143
157
132
149
High sodium (200 mmol/day)
161
161
179
176
162
155
172
156
146
162