A study was conducted to determine if differences in new textbook prices exist between on-campus bookstores, off-campus bookstores, and Internet bookstores. To control for differences in textbook prices that might exist across disciplines, the study randomly selected 12 textbooks and recorded the price of each of the 12 books at each of the three retailers. You may assume normality and equal-variance assumptions have been met. The partially completed ANOVA table based on the study's findings is shown here: 
Based on the study's findings, was it correct to block for differences in textbooks? Conduct the appropriate test at the alpha = 0.10 level of significance.
Definitions:
Optimal Future Savings
The most favorable or ideal planning and storing of financial resources for future needs or emergencies.
Discretionary Spending
Non-essential expenditures that individuals choose to make out of their available income after fulfilling all necessities.
Affordable Fitness Center
A gym or physical fitness facility offering memberships or services at a price that is reasonable or lower than average.
Nontraditional Student
A term for students who pursue tertiary education who may not fit into the traditional college-aged student demographic, often due to delayed enrollment, part-time attendance, or other life circumstances.
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