The table below shows quarterly sales data over four years.A regression of sales on quarters yields this equation: Sales = 18.25 + 1.55 × Quarter number.Using the regression estimate as the base,what is the seasonal index for the fourth quarter? (Pick the answer that is closest to the correct number.) 
Definitions:
Facial
Relating to the face, or to the facial nerve which controls muscles of expression, taste sensation, and more.
Auditory Tube
A tube that connects the middle ear to the back of the nose, helping equalize pressure in the ear; also known as the Eustachian tube.
Semicircular Canals
Three fluid-filled tubes in the inner ear that help maintain balance by sensing rotation of the head.
Cochlea
A spiral-shaped, fluid-filled inner ear structure that is essential for hearing as it transfers sound vibrations to nerve impulses.
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