✅ Correct Answer: 20% of the population
Source: This question is taken from the Pedagogy
✅ Correct Answer: create
✅ Correct Answer: Case
✅ Correct Answer: interview
✅ Correct Answer: observation
✅ Correct Answer: Survey
✅ Correct Answer: Naturalistic
✅ Correct Answer: major
✅ Correct Answer: questionnaire
✅ Correct Answer: studies
✅ Correct Answer: both