Exhibit 9.1
The following questions are based on the problem description and spreadsheet below.
A company has built a regression model to predict the number of labor hours (Yi) required to process a batch of parts (Xi). It has developed the following Excel spreadsheet of the results. 
-Refer to Exhibit 9.1. Interpret the meaning of R Square in cell B3 of the spreadsheet.
Definitions:
L-Alanine
An enantiomer of the amino acid alanine, which is a key compound in the biosynthesis of proteins.
Aqueous Solution
A mixture in which water serves as the solvent.
pH
A scale used to specify the acidity or basicity of an aqueous solution, correlating to the concentration of hydrogen ions present.
Isoelectric Point
The pH at which a molecule carries no net electrical charge or is electrically neutral in the statistical mean.
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