Microwave Sales Narrative
A microwave oven manufacturer has collected the data shown below on number of units sold (y) in the thousands of dollars and the number of ads (x) placed during the month. 
-Refer to Microwave Sales Narrative. Compute a 95% prediction interval for sales during the next month that happens to be associated with 140 ads.
Definitions:
Pupil
The adjustable opening in the center of the iris of the eye, through which light enters and is focused on the retina.
Retina
The layer of tissue that is located on the inner surface of the eyeball and contains the sensory receptors for vision.
Sclera
The white, outer layer of the eyeball that provides structure and protection.
Irises
The colored part of the eye that surrounds the pupil and controls the amount of light entering the eye by adjusting the size of the pupil.
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