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 are the degrees of freedom for the t test for two independent samples?
Definitions:
Globular Protein
Proteins that are roughly spherical in shape, often soluble in water and serving roles in catalysis, regulation, and transport.
Aspartic Acid
A non-essential amino acid involved in the synthesis of proteins and in the urea cycle of mammals.
Aqueous Surroundings
Refers to an environment or condition where water is the solvent surrounding a substance or structure.
Secondary Structure
The level of protein structure involving hydrogen bonding between the backbone amide and carbonyl groups, forming alpha-helices and beta-pleated sheets.
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