Based on quarterly data collected over the last four years, the following regression equation was found to forecast the quarterly demand for the number of new copies of an economics textbook: 
t = 3,305 - 665Qtr1 - 1,335Qtr2 + 305Qtr3, where Qtr1, Qtr2, and Qtr3 are dummy variables corresponding to Quarters 1, 2, and 3. Which of the following is not true?
Definitions:
The Joint Commission
An independent, not-for-profit organization that accredits and certifies health care organizations and programs in the United States.
American Medical Association
A professional association and lobbying group of physicians and medical students in the United States, aiming to promote the art and science of medicine for better public health.
Otorhinolaryngologist
A medical specialist focused on the treatment of diseases and conditions of the ear, nose, and throat (ENT), as well as related structures of the head and neck.
Nephrologist
A medical doctor specializing in the diagnosis and treatment of kidney diseases.
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