We are a school with a student population of 2,400. How many students should we contact using the ACHA-NCHA-Web?
The ACHA-NCHA Users Manual presents recommended sample sizes, or you can see the table of sample sizes listed below. Most ACHA-NCHA Web surveyors experience a range of 10% to 35% return. The average response proportion is about 25%. Thus, you may want to estimate the number of contacts based on a 25% return. With a school your size you should survey all 2,400 students with the aim of getting 600 submitted surveys. The net proportion of returned surveys depends in part on the following: (1) campus-wide prepublicity, (2) timing of first contact (do not survey just before finals or breaks), (3) contact of non-responders, (4) accuracy and utilization of e-mail addresses (e.g., do the students use the campus generated e-mail addresses?), (5) coordination with campus IT department to prevent interference from spam and/or rate control filters, and (6) incentives.
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