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Chronbach’s Alpha

Learn about Chronbach's Alpha, a reliability coefficient vital in survey research for assessing internal consistency of instruments. Explore its formula, interpretation, and significance in quantitative and qualitative research.

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Chronbach’s Alpha

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  1. Chronbach’s Alpha Ginnie Bushong

  2. Chronbach Alpha • Also known as Alpha Coefficient • An internal consistency or reliability coefficient for an instrument requiring only one test administration. • General form of the KR20 formula

  3. KR20 Formula • a = (k/k-1)(1-(Σsi2/st2)) • When: • k = number of conditions contributing to a total score • s = standard deviation • Range from 0 to 1.0 • a > .9 is excellent • a > .8 is good • a > .7 is acceptable • a > .6 is questionable • a > .5 is poor • a < .5 is unacceptable

  4. Survey Research • Validity • Will the survey provide the proper information for a researcher to determine a conclusion? • Pilot Test & Panel of Experts • Reliability • Will the survey produce consistent results? • Chronbach Alpha

  5. Quantitative Research • Meunier, R. A., Talbert, B. A. & Latour, M. A. (2002). Evaluation of the incubators in the classroom program: does it increase fourth grade students’ knowledge of agriculture-related science concepts? Journal of Agricultural Education 43(3), 49-60.

  6. Qualitative Research • Haygood, J., Baker, M., Hogg, J. & Bullock, S. (2004) The influence of foundational and expressed values on personal behaviors of teachers. Journal of Agricultural Education 45(1), 54-61.

  7. References • Chronbach, L J. (2004). My current thoughts on coefficient alpha and successor procedures. Educational and Psychological Measurement, 64(3), 391-418. Retrieved September 21, 2006 from EBSCOhost Database. • Frankel, J. R. & Wallen, N. E. (2006). How to design and evaluate research in education, sixth edition. Boston: McGraw Hill. • George, D. & Mallery, P. (2006). SPSS for Windows step by step. Boston: Pearson Education, Inc.

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