Closed questions for quantitative data
Closed-ended questions are narrow in focus and usually answered with a single word or from a small selection of options. For example, "Are you satisfied with this product?" — Yes/No/Mostly/Not quite.
Closed-ended questions give limited insight but can easily be analyzed for quantitative data. For example, one of the most popular closed questions in marketing is the Net Promoter Score (NPS) question, which asks people, "How likely are you to recommend this product/service on a scale from 0 to 10?" and uses numerical answers to calculate overall score trends.
Closed questions work best when used early in the survey, with more open-ended questions following.