How many participants does a research study need? Understand Sample Size, why 384–400 is common, and approaches including Cochran, Yamane, Krejcie & Morgan and Power Analysis.

Should you use a 4-, 5- or 7-point Likert scale? Compare their differences, research examples and effects on data to choose the right scale for your questionnaire.

Compare online vs offline surveys and learn the benefits of online survey data collection, including how Online Panels can help screen suitable research participants.

Learn how to reach the right target sample for online survey data collection using screening questions, demographic data and Online Panel respondent profiling.