A surgeon is experimenting with a new technique for implanting artificial blood vessels. Using this technique with a great many operations, the mean time before clotting of an artificial blood vessel has been 32.5 days with a standard deviation of 2.6 days. The following data were obtained on four operations. 
Definitions:
Aggressive Behavior
Actions or behaviors that are hostile, destructive, or violent towards others or oneself.
Braille
A tactile writing system used by people who are visually impaired, consisting of raised dots that represent letters, numbers, and punctuation marks.
Occipital Lobe
Situated in the rear part of the brain, this segment of the cerebral cortex is in charge of interpreting visual inputs.
Anatomy
The branch of biology concerned with the study of the structure of organisms and their parts.
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