The research project that actively infected subjects with syphilis to test the effectiveness of penicillin as a treatment is the _______

How many possible sequences would be needed for complete counterbalancing with three treatment conditions?

a. 3 b. 6 c. 9 d. 12

A public vote to approve a measure placed on the ballot by a state legislature or local government is a

a. popular referendum. b. legislative referendum. c. legislative initiative. d. popular initiative.