A Quality Analyst Wants to Construct a Sample Mean Chart

question 52

Multiple Choice

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is in control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each: $$\begin{array} { l l c c c } \text { Day } & & { \text { Weight (ounces) } } \\\hline \text { Monday } & 23 & 22 & 23 & 24 \\\text { Tuesday } & 23 & 21 & 19 & 21 \\\text { Wednesday } & 20 & 19 & 20 & 21 \\\text { Thursday } & 18 & 19 & 20 & 19 \\\text { Friday } & 18 & 20 & 22 & 20\end{array}$$
If he uses upper and lower control limits of 22 and 18 ounces, on what day(s) , if any, does this process appear to be out of control?

• A) Monday
• B) Tuesday
• C) Monday and Tuesday
• D) Monday, Tuesday, and Thursday
• E) None

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Definitions:

Ethical Conduct

Making decisions and taking actions aligned with moral principles and standards of behavior in both personal and professional settings.

Exchange Relationship

The interaction between two parties where goods, services, or ideas are exchanged, often characterized by mutual benefit.

Competitive Behavior

Refers to actions of companies that are aimed at gaining an advantage over rivals, often through strategies like pricing, product introduction, and advertising.

Socializing Force

Influences that shape individuals' behaviors, norms, and values through interactions within society and cultural environments.