Final answer:
To reduce nonsampling error in a survey, it is best to clarify survey questions to ensure they are clear and unambiguous.
Step-by-step explanation:
Nonsampling error refers to the errors that occur in a statistical survey, apart from any errors caused by the sampling process. The best way to reduce nonsampling error is to clarify survey questions to ensure they are clear and unambiguous. This helps to minimize any misunderstanding or misinterpretation of the questions by the respondents. By using clear and straightforward language, survey respondents are more likely to provide accurate and reliable answers.