The Kruskal-Wallis test is to be used to determine whether there is a significant difference (alpha = 0.05) between the three groups using the following data: 
For this test, how many degrees of freedom should be used?
Definitions:
High Normal Reading
Refers to a measurement or test result that is at the upper limit of the normal range, potentially indicating an increased risk for a condition or the need for closer monitoring.
Middle-Aged Adult
A person who is in the middle stage of life, typically considered to be between the ages of 40 and 65.
Older Person
An individual who has reached an advanced stage of life, often characterized by increased experience, wisdom, and sometimes, challenges related to aging.
Chest Discomfort
A symptom that can manifest as pain, pressure, or tightness in the chest area, potentially indicative of cardiovascular problems or other health issues.
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