Barber et al. (1996) conducted a study of Supportive Expressive Dynamic Psychotherapy on treating clinical depression. One of their analyses demonstrated a non-significant association between the therapist's competence and patient improvement. Consider the following propositions: Proposition I: The explanatory variable is patient improvement. Proposition II: The response variable is therapist's competence.

Proposition I is true and Proposition II is true Proposition I is true and Proposition II is falseProposition I is false and Proposition II is trueProposition I is false and Proposition II is falseNone of the above