You would like to determine the knowledge of geography of people aged 17 or older in the Capital Region. You decide that to make your study viable, you are going to collect data from all persons currently affiliated with UAlbany, students, faculty nad staff. With the help of Institutional research, you select a random sample of 500 persons at UAlbany and e-mail them a survey with geography questions.

There are other explanatory variables such age or nationality, that we would expect to be associated with the response variable.

We should

a. ignore the nationality of a person because all persons at UAlbany are educated.

b. randomly assign persons to nationality groups.

c. block persons according to their nationality

d. none of the above.