A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is calculated. The results are presented below. 
The researcher is interested in determining whether there is evidence that the two processes yield different average errors. What is the critical t value at the 1% level of significance?
Definitions:
Hippocampus
A region of the brain that is associated with memory formation, organization, and storage.
Amnesia
A condition characterized by memory loss, which can be due to factors like injury, disease, or psychological trauma.
Spacing Effect
The psychological principle stating that learning is more effective when study sessions are spaced out over time rather than being conducted in a single marathon session.
Mood-congruent Memory
The tendency to recall experiences that are consistent with one's current mood.
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