In a regression analysis of a first-order model involving 3 predictor variables and 25 observations, the following estimated regression equation was developed. 
= 12 - 18x1 + 4x2 + 15x3
Also, the following standard errors and the sum of squares were obtained.
Sb1 = 3
Sb2 = 6
Sb3 = 7
SST = 4900
SSE = 1296
The p-value for testing the significance of the regression model is
Definitions:
Depressive Disorders
A group of conditions characterized by persistent feelings of sadness and hopelessness and a lack of interest or pleasure in activities, significantly affecting one’s daily life.
ECT
Electroconvulsive Therapy (ECT) is a psychiatric treatment involving electrically induced seizures to provide relief from severe mental disorders.
Older Adults
Individuals typically over the age of 65 years, often considered within the context of geriatric psychology and health.
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A class of psychoactive drugs known for their calming effect, commonly prescribed for treating anxiety, insomnia, and other conditions.
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