Chronbachs Alpha Ginnie Bushong Chronbach Alpha Also known

Chronbach’s Alpha Ginnie Bushong

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 KR 20 formula

KR 20 Formula • a = (k/k-1)(1 -(Σsi 2/st 2)) – 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

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

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.

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.

References • Chronbach, L J. (2004). My current thoughts on coefficient alpha and successor procedures. Educational and Psychological Measurement, 64(3), 391418. 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: Mc. Graw Hill. • George, D. & Mallery, P. (2006). SPSS for Windows step by step. Boston: Pearson Education, Inc.