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:
Number
A mathematical object used to count, measure, and label.
Economic Rent
The extra income earned by a resource or property due to its unique status or location, over and above its production costs.
Running Back
A position in American and Canadian football where the player is part of the offensive team and is responsible for running with the ball.
60 Percent Rule
A guideline suggesting that up to 60% of an individual's gross income should be allocated towards fixed expenses and necessities.
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