A study was conducted to find the relationship between GI symptoms and psychological well-begin in adults who were on a gluten-free diet because of celiac disease. Data were not normally distributed. A negative relationship ( -.65, p<0.05) was found between GI symptoms (mild, moderate and sever) and psychological well-being (Likert Scale).

What statistical test was used?

Group of answer choices

a. Chi-square

b. Fisher's exact probability test

c. t-test

d. Spearman's rho