How Many People Do I Need to Take My Survey?

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Just finished designing your survey and have no idea how many people you should send it to? We've got you covered! Our in-house Survey Scientist, Sarah Cho the Survey Pro, answers this question and more.

Published in: Data & Analytics, Technology
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How Many People Do I Need to Take My Survey?

  1. 1. SurveyMonkey Office Hours Sarah Cho, Survey Research Scientist JUNE 9, 2014
  2. 2. Today’s topic: How many people do I need to take my survey? 2
  3. 3. Meet Kathy, a teacher and event organizer 3 • Organized a conference for teachers and wants to gather feedback on the conference How many respondents do I need?
  4. 4. Questions to answer before you start surveying 4 • Who is your target population? • What is the size of your target population? • How much error are you willing to tolerate? • What type of response rate do you expect? • Are you thinking of breaking the data down by subgroups?
  5. 5. Who is your target population? 5 • Conference attendees • Invited teachers who did not attend
  6. 6. What is the size of your target population? 6 • 2500 teachers were invited to the conference - Target population #1: 500 teachers registered and attended (attendees) - Target population #2: 2000 teachers who were invited but did not attend (non-attendees)
  7. 7. How much error are you willing to tolerate? 7 • Attendees: Make improvements to conference agenda and amenities • Non-attendees: Improve program quality or relocate conference to improve attendance rate
  8. 8. How much error are you willing to tolerate? 8
  9. 9. What type of response rate do you expect? 9 • Attendees: 75% • Non-attendees: 25% How many teachers will take my survey?
  10. 10. What type of response do you expect? Let’s do some math! 10 Total sample desired ÷ expected response rate = total invites needed • Total sample desired: - 220 Attendees - 350 Non-attendees • Total invites needed: - Attendees: 200 ÷ 0.75 = ~300 - Non-attendees: 350 ÷ 0.25 = ~1400
  11. 11. Are you thinking about breaking down the data by subgroups? 11 • For non-attendees: geographic area • For conference attendees: Seasoned veterans versus newbies • 50 % newbies, 50% seasoned veterans • Overall sample size: 220 • 110 newbies • 110 seasoned veterans • 10% newbies, 90% seasoned veterans • Overall sample size: 220 • 22 newbies • 198 seasoned veterans
  12. 12. YouTube: youtube.com/surveymonkey Twitter: @SurveyMonkey; FB: facebook.com/SurveyMonkey Google+: plus.google.com/+surveymonkey 12 Questions? Don’t be shy!

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