A quality analyst wants to construct a sample mean chart for controlling a packaging process.He knows from past experience that the process standard deviation is two ounces.Each day last week,he randomly selected four packages and weighed each.The data from that activity appears below. 
(a)Calculate all sample means and the mean of all sample means.
(b)Calculate upper and lower control limits that allow for natural variations.
(c)Is this process in control?
Definitions:
Interim Statements
Financial reports prepared and presented for periods shorter than a fiscal year, such as quarterly or monthly financial statements.
Prepaid Rent
An expense account that represents rent payments made in advance of the rental period, treated as an asset on the balance sheet until the period to which it relates passes.
Adjusting Entry
Accounting records entries recorded at the close of an accounting period for the purpose of assigning incomes and expenses to the timeframe in which they truly transpired.
Net Income
The total profit of a company after all expenses, including taxes and operational costs, have been subtracted from total revenues.
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