In a study of the bidding behavior when antique grandfather clocks are sold at auction, investigators analyzed the selling price (y) and the age in years of the grandfather clock (x). Summary quantities from this analysis yield: n = 32 
Sxx = 23625.9 
se = 273.03
a) Calculate the estimated standard deviation of a + bx* for x* = 150.
b) For what value x* is the estimated standard deviation of a + bx* smallest, and why?
Definitions:
Unipolar Depression
A major depressive disorder characterized by a persistent feeling of sadness or a lack of interest in outside stimuli.
Diagnosable Symptoms
Observable signs and symptoms that can be identified and used to diagnose a particular medical condition or disease.
Major Depressive Episode
A period characterized by a severely depressed mood or a loss of interest or pleasure in daily activities, lasting for at least two weeks, along with other symptoms.
Melancholic
Pertaining to melancholy, a mood disorder characterized by feelings of deep sadness, despondency, and pessimism.
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