A soap manufacturer is experimenting with several formulas of soap powder. Three of the formulas were selected for further testing by a panel of homemakers. The ratings for the three formulas are as follows: 
What is the number of degrees of freedom?
Definitions:
Saving
The portion of income that is not spent on immediate consumption but is set aside for future use, often in investments or deposits.
Disposable Income
The available amount for households to spend and save, subsequent to income tax deductions.
Autonomous Consumption
The level of consumption that occurs when income is zero, representing the expenditures that consumers must make even when they have no income.
Disposable Income
Refers to the funds that individuals can spend or save after all income taxes are deducted.
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