A researcher wants to examine the relationship between post -partum depression and maternal age . She recruits 50 women who have given birth within the last 3 months from the WIC Women , Infants , & Children Food and Nutrition ) office . She collects demographic information from each woman ( including age , race / ethnicity , and educational achievement ) as well as administering a post -partum depression survey . Which of the following statistical tests should she select for her analysis ? Answers : a Chi - square Pearson's correlation coefficient ( ) Independent samples t- test