A 42 year old male presents with a right side palpable scrot…

A 42 year old male presents with a right side palpable scrotal lump. A small cystic area is visualized in the right epididymal head. This patient informs you that he had a vasectomy a few months ago. Based on the above information, what is the most likely diagnosis?

A small city is considering building a community swimming po…

A small city is considering building a community swimming pool using public funds. The city planner will survey a random sample of residents to ascertain support.  If she takes her random sample from a list of the parents of school children in the city school district, her sample may not be representative of all the residents of the city, so it will suffer from which problem?