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:
Seaport
a coastal town or city with facilities for loading and unloading ships, playing a critical role in international trade and travel.
American System
An economic plan in the early 19th century advocating for high tariffs, a national bank, and internal improvements to develop the U.S. economy and reduce reliance on imports.
Domestic Economic Development
The process of fostering economic growth and improving economic health within a country, often involving investments in infrastructure, industry, and human capital.
Foreign Economic Development
The process of stimulating economic growth and development in developing countries through international aid, investment, and policy support.
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