A physical therapist is interested in whether people with different bone structures will be affected differently by her new therapy program.She randomly chooses two groups of patients based on bone type: small-boned frame (XS) and large-boned frame (XL) .Patients all had similar injuries.She measures the number of days each person takes to progress to a predetermined point.Here is the data: 
What is the null hypothesis?
Definitions:
Behavior Modification
A systematic approach to changing behavior through various techniques and strategies, such as reinforcement and punishment.
Safety Gear
Equipment designed to protect individuals from accidents or injuries in various environments.
A-B-Cs
An acronym for Antecedents, Behaviors, and Consequences, a framework in behavioral analysis to understand the effect of environmental factors on behavior.
Behavior Modification
The application of reinforcement or punishment techniques to change a person's behavior.
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