A distributor of personal computers has five locations in the city. The sales in units for the first quarter of the year were as follows: 
What is the critical value at the 0.01 level of risk?
Definitions:
Optic Nerve
The nerve that transmits visual information from the retina to the brain.
Fovea
A small depression in the retina of the eye where visual acuity is highest, due to the concentration of cone cells.
Iris
The colored part of the eye surrounding the pupil, responsible for controlling the amount of light reaching the retina.
Ganglion Cells
Neurons located in the retina that receive visual information from photoreceptors and transmit it to the brain.
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