A cell phone company wants to determine if the use of text messaging is independent of age. The following data has been collected from a random sample of customers. 
To conduct a contingency analysis, the number of degrees of freedom is:
Definitions:
Biopsy Specimens
Samples of tissue taken from the body for diagnostic examination, usually to determine the presence or extent of a disease.
Unsterile Assistant
A healthcare role that performs non-sterile tasks and supports the medical team without directly engaging in sterile procedures.
Debris
Scattered pieces of waste or remains, often from construction, demolition, or natural disasters.
Suture Material
A specific type of thread used in surgery to close wounds or incisions.
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