Question

Suppose we conduct a study of postpartum depression among women in Virginia. We decide to recruit 100 women by (1) visiting obstetrics clinics throughout Virginia, (2) recruiting all women with postpartum depression at these clinics, and (3) recruiting any family members of patients who have also had postpartum depression. Our final sample included the numeric depression score for 100 women from 87 families. We want to conduct a hypothesis test for determining whether mean depression score in Virginia is different than the US national average. Suppose the distribution of depression scores is approximately normal. Which of the following is true: All conditions for conducting hypothesis testing are met. We do not have enough information to determine whether we can conduct hypothesis testing. The required sample size is not met to conduct this analysis. The observations are not independent.

Answer 1

Since the samples consist of all women with postpartum depression at obstetrics clinics and also any family members of patients who have also had postpartum depression. Thus, the sample observations are not independent.

The true statement is,

The observations are not independent.