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A null hypothesis is:
Patient Care
The services provided by healthcare professionals to diagnose, treat, and manage patients' health and wellbeing.
Pharmaceutical Companies
Businesses involved in the research, development, production, and marketing of drugs and medications.
Insurance Companies
Organizations that provide financial protection and compensation for losses or damages in exchange for payment of premiums.
The Bell Curve
A controversial book by Richard Herrnstein and Charles Murray, discussing human intelligence and its relationship with social class, race, and outcomes in America.
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