Use the table below to answer the following question. 
What is the average total cost at an output level of four units?
Definitions:
Correlation
A measure of the degree to which two variables change together, indicating a relationship between them but not causation.
Survey Study
A research method involving the collection of data from a predetermined population or group by means of a questionnaire or interview.
Manipulates Factors
The adjustment or control of variables or conditions in a study or experiment to examine their effects on an outcome.
Research Method
A systematic approach to collecting data and performing scientific investigations to expand and refine knowledge in a particular field.
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