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 estimated standard error of the difference?
Definitions:
Habitat
Place where an organism lives and is able to survive and reproduce.
Per Capita Rate
A statistical measure that expresses the quantity of something per individual person within a population or area.
Spawn
The process by which many aquatic animals release or deposit eggs into water.
Die-off
A sharp reduction in the population of a species due to environmental events or human actions.
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