A quality analyst wants to construct a sample mean chart for controlling a packaging process.He knows from past experience that when the process is operating as intended,packaging weight is normally distributed with a mean of twenty ounces,and a process standard deviation of two ounces.Each day last week,he randomly selected four packages and weighed each.The data from that activity appear below.
(a)If he sets an upper control limit of 21 and a lower control limit of 19 around the target value of twenty ounces,the control chart is based on what value of z?
(b)With the UCL and LCL of part a,what do you conclude about this process-is it in control?
Definitions:
Obstetric Visit
A medical appointment during pregnancy where a healthcare provider checks the health of the pregnant person and the developing fetus.
Alcohol
A chemical compound commonly known for its presence in beverages and its psychoactive effects.
Alcohol Use
The consumption of beverages containing ethanol, which can range from moderate drinking to alcohol abuse or dependence.
Withdrawal Symptoms
Physical or mental effects that occur after stopping or reducing intake of a substance that was used regularly.
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