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?

A recent study indicated that the diabetes drug metformin (a…

A recent study indicated that the diabetes drug metformin (a glucose-lowering drug) appears to lower users’ risk of developing age-related diseases such as cancer, cardio-vascular disease, and dementia. The study followed diabetic men over the age of 65, all of whom had been prescribed a diabetes drug by their Veteran’s Administration hospital physicians. At the end of nine years, the researchers compared the rates at which the metformin users developed other diseases with that of the men who were taking a different diabetes drug.   Identify the Explanatory and Response variables.