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:
Catabolism
The aspect of metabolism in which complex substances are broken down to form simpler substances; catabolic reactions are particularly important in releasing chemical energy stored by the cell. Compare with anabolism.
Anabolism
The aspect of metabolism in which simpler substances are combined to form more complex substances, resulting in the storage of energy, the production of new cell materials, and growth. Compare with catabolism.
Parabronchi
The small, air-filled tubes in the lungs of birds through which air flows for highly efficient gas exchange.
Countercurrent Exchange
A mechanism occurring in nature and designed systems wherein two flowing bodies of water, air, or other substances move in opposite directions of each other to maximize the transfer rate of heat or matter.
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