A forecaster develops a linear regression model for quarterly sales data shown in the table.The slope of the regression equation is 37.9 and the intercept is 57.Use the regression model to determine the seasonal index for the third quarter. 
Definitions:
Negative Body Image
A subjective perception of one's physical appearance that is overly critical and dissatisfied.
Altered Self-concept
A change in how one perceives oneself, which can be due to various factors such as illness, injury, or significant life events.
Slumped Posture
A position in which the head and shoulders are drooping, indicating potential discomfort or poor ergonomic practices.
Authentic Lifestyle
Living in a way that is true to one's self, values, and beliefs, without wearing a facade for others.
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