A manufacturer of automobile transmissions uses three different processes. Management ordered a study of the production costs to see if there is a difference among the three processes. A summary of the findings is shown below. 
What are the total degrees of freedom?
Definitions:
Annual Returns
The percentage change in an investment's value over a one-year period, including both capital gains and dividends, used to assess its performance.
Real Rate
The interest rate adjusted for inflation, representing the true cost of borrowing.
Inflation
The increase rate in the general price tag for goods and services, eroding financial capacity.
Standard Deviation
A statistical measure that represents the dispersion or variability of a set of data points or values in a dataset.
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