When issuing a textbook, there is always a number of defective copies. The publishing house conducts a study to determine whether the number of defective copies depends on the format of the textbook. For the study, three random samples of textbook editions for the different book sizes were generated: a large portrait, a portrait, and a US letter, each of the editions has approximately equal number of copies. Twenty-one textbooks of each format were used for the study. Table containing summary data is presented below. 
Using a multiple comparison procedure identify differences between average number of defective copies. Use 95% Tukey-Kramer confidence interval.
Definitions:
Critical Theory
A philosophical approach to culture, literature, and art that seeks to confront the social, historical, and ideological forces and structures that produce and constrain it.
A Priori Method
A method of reasoning based on theoretical deduction rather than empirical evidence.
Critical Theory
A framework developed for critiquing society and culture by applying knowledge from the social sciences and the humanities.
Social Constructions
Concepts or perceptions of reality based on societal norms and interactions, which are constructed by members of a society.
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