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:
Kansas City Royals
A Major League Baseball team based in Kansas City, Missouri, known for their competitive games and loyal fan base.
Res Ipsa Loquitur
A legal doctrine that allows for the presumption of negligence in a lawsuit, given the type of accident or injury could not have occurred without negligence.
Negligence
Failure to exercise the care that a reasonably prudent person would exercise in similar circumstances, resulting in harm.
Severity
The extent of seriousness or gravity of a situation, condition, or event.
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