When using the Friedman test to test the following data to determine whether there is a significant difference between treatment levels with α = 0.05, the critical value of chi-square is ___. 
Definitions:
Economic Concept
A theoretical idea that encompasses principles, theories, and models explaining how economies operate and how economic agents interact.
Reducing Pollution
The process of decreasing the amount and impact of contaminants released into the environment.
Tax Per Unit
A fixed amount of tax imposed on each unit of a good or service, which can affect production costs and market prices.
Negative Impact
An adverse effect or harm that arises from a particular process or action.
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