A professor surveys his students about their opinions on how well he taught the course. He puts this survey on the last page of his final exam. Which type of bias will most likely have the strongest effect on the survey results? Not all students will have the access needed to find the survey.
Students may not truthfully reply because they fear it will affect their grade.
Students may not understand the wording used in the survey.
Not all students will be represented in the survey sample.

The answer would be “students may not truthfully reply because they fear it will affect their grade.”

Why?
The first option is wrong because the students would have checked each page to ensure completion. We can also assume that the teacher would remind/announce students that there is a survey.

The third option is wrong because it is very unlikely. We can assume that students would ask for help when needed or randomly mark the survey to complete the survey as it is generally a opinion section that won’t be mark as there is no correct answer and it is a survey.

The fourth option is wrong as it contradicts the “he puts this survey on the last page of the exam.” Meaning that all students present for the exam would be given the survey.