Manufacturing Plant Machines
A mechanical engineer at a manufacturing plant keeps a close watch on the performance and condition of the machines. The following data are the weight losses (in milligrams) of certain machine parts due to friction when used with three different lubricants. 
-Refer to Manufacturing Plant Machines graphics. Set up the rejection region for 
= 0.01.
Definitions:
Net Income
The profit of a company after all expenses and taxes have been deducted from total revenue.
Retained Earnings
The portion of a company's profits that is held or retained and saved for future use, investment, or to pay debt, instead of being paid out as dividends.
Statement Of Retained Earnings
A financial report that reveals the changes in retained earnings for a particular period of time.
December 31
Refers to the last day of the year, often associated with the end of the fiscal year for many companies.
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