Sound engineers studied factors that might affect the output (in decibels) of a rock concert speaker system.The results of their ANOVA tests are shown (some information is missing) . 
The number of observations per cell was:
Definitions:
Bulk Purchasing
The acquisition of goods or products in large quantities, often at a discounted price.
Profit Margins
A financial metric that measures the percentage of profit a company makes for each dollar of sales, indicating how effectively a company is managing its expenses relative to its net sales.
Management Structure
The hierarchical arrangement of lines of authority, communications, rights, and duties within an organization.
Franchise
A business model that allows individuals to own and operate their branch or location of an existing larger brand or business.
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