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 appear below.
(a)Calculate all sample means and the mean of all sample means.
(b)Calculate upper and lower 2-sigma x-bar chart control limits that allow for natural variations.
(c)Based on the x-bar chart,is this process in control?
Definitions:
Wire Transfers
Electronic transfers of funds across a network administered by banks or transfer service agencies globally.
Average Collection Period
The average number of days it takes a company to collect payments from its credit sales.
Credit Sale
A transaction where the payment for the purchased goods or services is deferred to a future date.
Credit Applicant
A Credit Applicant is an individual or business entity that applies for a loan or line of credit from a lending institution.
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