An important hypothesis in hypertension research is that sodium restriction may lower blood pressure. However, it is difficult to achieve sodium restriction over the long term, and dietary counseling in a group setting is sometimes used to achieve this goal. The data on urinary sodium in HW4 Q3.sav on Canvas were obtained from 8 individuals enrolled in a sodium-restricted group. Data were collected at baseline and after 1 week of dietary counseling. Assume the population of urinary sodium follows a normal distribution.