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1.
Introduction to Power Analysis : Two-Group Studies by Hedberg, E. C. ISBN: 9781506343129 List Price: $22.00
2.
BUNDLE: Hedberg: Introduction to Power Analysis: Two-Group Studies (Paperback) + Schroeder: ... by Hedberg, E. C., Schroeder, ... ISBN: 9781544350684 List Price: $35.00