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 calculated value of chi-square is ___. 
Definitions:
Optimal Point
The most favorable or advantageous condition or value of a variable determined within a given set of constraints.
Marginal Benefits
The added pleasure or value that comes from the additional consumption or production of a good or service unit.
Marginal Costs
The supplementary cost involved in the production of one more unit of a product or service.
Production Possibilities Curve
A graph that shows the maximum number of possible units of two commodities that a economy can produce with available resources and technology.
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