Question

2) A government agency produced a study in which they randomly chose 100 students just beginning college to determine what percentage of students who begin college graduate with a degree. After four years they identified that 23 had dropped out of college, 45 had graduated, and 20 were still pursuing their degree. What is wrong with this poll?
A. a nonresponse occurred.
B. This is a self-interest study.
C. Some of the sample data are missing
D. The relationship between two variables implies one causes the other.

Answer 1

The answer is B. some of the sample data are missing.

This is because out of the 100 students originally sampled by the government agency, only 88 results were taken. 

Additionally, we cannot fully take A. as the answer because a non-response error happens when sampling units are not interviewed maybe because they were unavailable or unwilling. So B. is the safer answer.