Research guides
Short, free guides to the survey-research questions students ask us most. Our full library of 43 guides is in Thai.
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Taro Yamane vs Krejcie & Morgan vs Cochran vs G*Power: Which Sample-Size Method?
Compare the four most common sample-size methods — Taro Yamane, Krejcie & Morgan, Cochran, and G*Power — when to use each, and which is most accepted today.
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Article
How to Calculate Mean & S.D. for Likert-Scale Questionnaires (with 5-Level Interpretation)
Learn how to compute the mean (x̄) and standard deviation (S.D.) for Likert-scale survey data and interpret them using Best's (1977) five-level criterion for Chapter 4.
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Article
Why Cronbach's Alpha Matters in Research (and How to Interpret It)
Understand what Cronbach's Alpha measures, what counts as a good value (0.70+), why reliability matters for your thesis, and how to interpret and improve it.
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