A researcher is interested in the effectiveness of a new form of psychotherapy.Twelve clinic patients are randomly assigned to each of two groups, with one group receiving this new form of therapy, the other receiving traditional therapy.The therapies are evaluated by giving each patient a depression survey after treatment.What is the null hypothesis in this situation?

Select one:

a.H0:new= u traditional

b.H0:new= 0

c.H0:new< .05

d.H0:diff= 0