The following data were collected to determine whether or not the retirement age is the same for people in different professions. 
How many degrees of freedom are there for the chi-square test statistic?
Definitions:
Bar Charts
A graphical representation of data using bars of different lengths to compare values across categories.
Financial Planning
The process of creating strategies for managing financial resources effectively to meet life goals.
Retirement Annuity
A financial product that provides a stream of payments to an individual after retirement, funded through either periodic or lump sum contributions.
IRA
An Individual Retirement Account, a financial tool used in the United States to save for retirement with tax advantages.
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