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:
Reconstruction
The process of rebuilding or forming an approximation of past events or experiences from available information.
Tip-Of-The-Tongue
A cognitive phenomenon where a person cannot recall a familiar word or name but has a strong feeling that they are on the verge of remembering it.
Target Word
A specific word that is the focus of attention in various linguistic or psychological tests or experiments.
Short-Term Memory
A component of memory where small amounts of information can be kept for a short period of time.
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