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SurveyMonkey Office Hours Sarah Cho, Survey Research Scientist JUNE 9, 2014
Today’s topic: How many people do I need to take my survey? 2
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?
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?
Who is your target population? 5 Conference attendees Invited teachers who did not attend
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)
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
How much error are you willing to tolerate? 8
What type of response rate do you expect? 9 Attendees: 75% Non-attendees: 25% How many teachers will take my survey?
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
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
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