The research department at Riverside community hospital wanted to know if patient satisfaction was better at their hospital. The average satisfaction rating for all hospitals were 7.8 (on a 1-10 scale) with a sigma of .5. The average satisfaction for Riverside community hospital was 8.1 with a standard deviation of 1.5. What test should be used?

A. Independent t test

B. t-test (one sample)

C. All the choices are correct