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Sample Size Calculator (web)

Cronbach's alpha - Hypothesis Testing

Minimum acceptable Cronbach's alpha (H₀):
Expected Cronbach's alpha (H₁):
Significance level (α): Two-tailed
Power (1 - β): %
Number of items (k):
Expected dropout rate: %

Sample size, n =
Sample size (with 10% dropout), n_drop =

Cronbach's alpha - Estimation

Expected Cronbach's alpha:
Precision (± expected):
Confidence level 100(1 - α): %
Number of items (k):
Expected dropout rate: %

Sample size, n =
Sample size (with 10% dropout), n_drop =

References:

Bonett, D. G. (2002). Sample size requirements for testing and estimating coefficient alpha. Journal of educational and behavioral statistics, 27(4), 335-340.

Suggested reference:

APA: Arifin, W. N. (2018). A web-based sample size calculator for reliability studies. Education in Medicine Journal, 10(3), 67–76. https://doi.org/10.21315/eimj2018.10.3.8

Vancouver: Arifin, WN. A web-based sample size calculator for reliability studies. Education in Medicine Journal. 2018;10(3):67–76. https://doi.org/10.21315/eimj2018.10.3.8

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