A patient arrives for an abdominal ultrasound.  Upon interro…

A patient arrives for an abdominal ultrasound.  Upon interrogation you see a mass protecting into the lumen that arise from the gallbladder wall, it does NOT shadow and does NOT move with a change in patient position, and no comet-tail artifact seen. What is the likely diagnosis?

This is the most basic single-subject research design. It is…

This is the most basic single-subject research design. It is ideally suited to show that specific features of the environment regulate an organism’s behavior. When using this design, the researcher takes repeated measurements of behavior before, during, and after multiple introductions of an environmental change.