A Quality Analyst Wants to Construct a Sample Mean Chart

question 135

Essay

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 appears 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, what is the probability of concluding that this process is out of control when it is actually in control?
(b) With the UCL and LCL of part a, what do you conclude about this process-is it in control?

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Definitions:

Sterile Gown

A gown that is free from all microorganisms, utilized in medical and surgical settings to prevent the spread of infection and maintain a sterile environment.

Operating Suite

A designated area in a hospital where surgical operations are performed, equipped with necessary medical equipment and staffed by surgical professionals.

Surgical Technologist

A healthcare professional trained to assist surgeons during surgical procedures.

Risk Of Infection

The probability or likelihood of being exposed to and acquiring an infection.