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References

  • Cohen, J. (1969). Statistical power analysis for the behavioral sciences. New York, NY: Academic Press.
  • Glass, G., McGaw, B. & Smith, M. L. (1981). Meta analysis in social research. Beverly Hills, CA: Sage.
  • Krajcik, J. S. & Penick, J. E. (1989). Evaluation of a model science education program. Journal of Research in Science Teaching, 26, 795810.