Question

Which of the following may not constitute voluntary participation?
a. give students who complete the research questionnaire extra credit
b. allow students to fill out a questionnaire on their own time and when they finish put them in a box outside the
departmental secretary's office
c. ask that students fill out a questionnaire and not include their name or student identification number
d. on in-class questionnaires have the professor leave the room while they are being filled out and turned in and allow students to remain anonymous

Answer

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